Some of the not-show characters:
ḍ - ḍ
ḥ - ḥ
ḫ - ḫ
ḳ - ḳ
All the characters that not shown in Android WebView, HTML Entity's are greater than 7000.
I tried the solution below but it didn't work.
WebSettings settings = myWebView.getSettings();
settings.setDefaultTextEncodingName("utf-8");
myWebView.loadDataWithBaseURL(null, "#ḍḥḳ#", "text/html", "utf-8", null);
It showed in WebView : " "
I'll be very thankful for any advice.