diff --git a/build.gradle b/build.gradle
index 2bf8ed519..92033c42a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,7 +7,7 @@ buildscript {
         propMinSdkVersion = 16
         propTargetSdkVersion = propCompileSdkVersion
         propVersionCode = 1
-        propVersionName = '4.6.5'
+        propVersionName = '4.6.6'
         kotlin_version = '1.2.60'
         support_libs = '27.1.1'
     }
diff --git a/commons/src/main/kotlin/com/simplemobiletools/commons/extensions/String.kt b/commons/src/main/kotlin/com/simplemobiletools/commons/extensions/String.kt
index e395785bd..3ba86d252 100644
--- a/commons/src/main/kotlin/com/simplemobiletools/commons/extensions/String.kt
+++ b/commons/src/main/kotlin/com/simplemobiletools/commons/extensions/String.kt
@@ -10,6 +10,7 @@ import android.text.Spannable
 import android.text.SpannableString
 import android.text.style.ForegroundColorSpan
 import com.simplemobiletools.commons.helpers.*
+import java.text.Normalizer
 import java.text.SimpleDateFormat
 import java.util.*
 
@@ -234,14 +235,14 @@ fun String.highlightTextPart(textToHighlight: String, color: Int, highlightAll:
         return spannableString
     }
 
-    var startIndex = indexOf(textToHighlight, 0, true)
+    var startIndex = normalizeString().indexOf(textToHighlight, 0, true)
     val indexes = ArrayList<Int>()
     while (startIndex >= 0) {
         if (startIndex != -1) {
             indexes.add(startIndex)
         }
 
-        startIndex = indexOf(textToHighlight, startIndex + textToHighlight.length, true)
+        startIndex = normalizeString().indexOf(textToHighlight, startIndex + textToHighlight.length, true)
         if (!highlightAll) {
             break
         }
@@ -255,6 +256,8 @@ fun String.highlightTextPart(textToHighlight: String, color: Int, highlightAll:
     return spannableString
 }
 
+fun String.normalizeString() = Normalizer.normalize(this, Normalizer.Form.NFD).replace(normalizeRegex, "")
+
 fun String.getMimeType(): String {
     val typesMap = HashMap<String, String>().apply {
         put("323", "text/h323")
diff --git a/commons/src/main/kotlin/com/simplemobiletools/commons/helpers/Constants.kt b/commons/src/main/kotlin/com/simplemobiletools/commons/helpers/Constants.kt
index f041e4605..6cf11e10f 100644
--- a/commons/src/main/kotlin/com/simplemobiletools/commons/helpers/Constants.kt
+++ b/commons/src/main/kotlin/com/simplemobiletools/commons/helpers/Constants.kt
@@ -236,3 +236,5 @@ fun getDateFormats() = arrayListOf(
         "MM/dd",
         "MM.dd"
 )
+
+val normalizeRegex = "\\p{InCombiningDiacriticalMarks}+".toRegex()