There is a very serious bug of partial search in chat history (in any telegram platform) , which stop millions of Line/Whatsapp users / groups to switch to Telegram platform , while whatsapp's ads is coming , which is become very urgent/important to get Telegram ready , this is a very basic feature which works well in Whatsapp/Line , hope Telegram can listen.

Telegram is the best IM client on the planet , compare to others :

1. the best user experience across different platform : desktop / web / mobile  (while whatsapp is a fake desktop client)
2. real multiple devices (while whatsapp allow only one mobile device)
3. real cloud storage which you never need to worry about switching to new device (while whatsapp+google backup is still a headache)
4. and many more : bots/api/channels/stickers

(although we're not sure when Telegram will become an ads-app)

some very good post already show the error here :

https://github.com/telegramdesktop/tdesktop/issues/7096

https://www.reddit.com/r/Telegram/comments/7gjcsf/how_to_search_for_telegram_with_a_keyword_gram/

https://github.com/telegramdesktop/tdesktop/issues/1562#issuecomment-583126381

Chinese Translation below (以下中文翻譯) :
Telegram 有一個嚴重的缺失 , 就是無法 '部份搜尋' 聊天記錄 (不論你用的是什麼平台) , 這個問題導致很多Line/Whatsapp用戶不能轉用Telegram , 正當Whatsapp的廣告快將推出 , 現在是把Telegram的基本功能做好是極為重要 , 這是一個非常基本的巧能而Whatsapp/Line都做得好 , 希望Telegram能夠聴到我們的意見