diff --git a/src/db/_utils.js b/src/db/_utils.js
index 89686f4..2c81f47 100644
--- a/src/db/_utils.js
+++ b/src/db/_utils.js
@@ -2,7 +2,7 @@ export function calculateNextShowTime(startTime, showedAmount) {
     const minutes = startTime + 1000 * 60
     const hours = startTime + 1000 * 3600
     const days = startTime + 1000 * 3600 * 24
-    switch (showedAmount){
+    switch (showedAmount) {
         case 0:
             return minutes * 10     // 10 minutes
         case 1:
@@ -18,4 +18,27 @@ export function calculateNextShowTime(startTime, showedAmount) {
         case 6:
             return days * 30 * 4    // 4 month
     }
+}
+
+export function compareWithTagsAndFolder(memos = [], tags, folder) {
+    const resultMemos = []
+
+    memos.forEach(memo => {
+        var folderOkey = false, tagsOkey = false
+        if (!folder) folderOkey = true
+        if (tags.length === 0) tagsOkey = true
+
+        if (folder && memo.folder === folder)
+            folderOkey = true
+
+        for (let index = 0; index < tags.length; index++) {
+            const tag = tags[index]
+            if (memo.tags.includes(tag)) {
+                tagsOkey = true; break
+            }
+        }
+        if (folderOkey && tagsOkey) resultMemos.push(memo)
+    })
+
+    return resultMemos
 }
\ No newline at end of file
diff --git a/src/db/api.js b/src/db/api.js
index fdac966..2d06521 100644
--- a/src/db/api.js
+++ b/src/db/api.js
@@ -65,4 +65,23 @@ export function markMemoRepeated(memoId, callback = (err, res) => { }) {
             .then(res => callback(false, res))
             .catch(err => callback(err, false))
     }
+}
+
+/**
+ * search: all memos {from, to} AND folder AND (memo tags contain any of given tags)
+ * @param {*} from date.getTime() if not provided will use minimum
+ * @param {*} to date.getTime() if not provided will use maximum
+ * @param {*} tags Search by OR
+ * @param {*} folder if no matter send undefined
+ * @param {*} callback (err, memo_list)
+ */
+export function searchMemo(from, to, tags = [], folder, callback) {
+    let openRequest = indexedDB.open("memos", 1)
+
+    openRequest.onsuccess = function () {
+        let db = openRequest.result
+        controllers.searchMemo(db, from, to, tags, folder)
+            .then(res => callback(false, res))
+            .catch(err => callback(err, false))
+    }
 }
\ No newline at end of file
diff --git a/src/db/controllers.js b/src/db/controllers.js
index 1a8f110..902fcaf 100644
--- a/src/db/controllers.js
+++ b/src/db/controllers.js
@@ -1,4 +1,4 @@
-import { calculateNextShowTime } from "./_utils"
+import { calculateNextShowTime, compareWithTagsAndFolder } from "./_utils"
 
 export async function addNewMemo(db, memoText, startShowAt, tags, folder) {
     return await new Promise((resolve, reject) => {
@@ -52,7 +52,7 @@ export async function searchUnresolvedMemos(db) {
             resolve(request.result)
         }
         request.onerror = function (e) {
-            reject('error searching book in db', e)
+            reject('error searching unresolved memos in db', e)
         }
     })
 }
@@ -72,7 +72,28 @@ export async function handleMemoRepeated(db, memoId) {
             resolve(true)
         }
         request.onerror = function (e) {
-            reject('error searching book in db', e)
+            reject('error memo handle repeated', e)
+        }
+    })
+}
+
+export async function searchMemo(db, from, to, tags, folder) {
+    return await new Promise((resolve, reject) => {
+        if (!from) from = 0
+        if (!to) to = 3691082609569
+        let transaction = db.transaction("memos");
+        let memos = transaction.objectStore('memos')
+        let timeShowIndex = memos.index('time_index')
+
+        let request = timeShowIndex.getAll(IDBKeyRange.bound(from, to))
+
+        request.onsuccess = function () {
+            console.log('From to result: ',request.result);
+            const memos = compareWithTagsAndFolder(request.result, tags, folder)
+            resolve(memos)
+        }
+        request.onerror = function (e) {
+            reject('error searching memo in db', e)
         }
     })
 }
\ No newline at end of file
diff --git a/src/db/index.js b/src/db/index.js
index 91b3933..05aa6ed 100644
--- a/src/db/index.js
+++ b/src/db/index.js
@@ -9,12 +9,10 @@ export function initdb() {
         if (!db.objectStoreNames.contains("memos")) {
             let memos = db.createObjectStore("memos", { keyPath: "id" })
             memos.createIndex('time_index', 'timeNextShow')
-            memos.createIndex('folder_index', 'folder')
         }
         else {
             let memos = txn.objectStore('memos')
             memos.createIndex('time_index', 'timeNextShow')
-            memos.createIndex('folder_index', 'folder')
         }
     }