Thank you, we will consider this. Telegram evolves quickly and new features are added every month. We can't promise anything or give an exact timeframe, but suggestions are always welcome. 😁
At the moment, Telegram considers an entire Chinese sentence to be a single "word". Since Telegram does not support partial word searches, searching for a Chinese word inside a Chinese sentence will not return a successful result. I do hope this situation can be rectified in the near future. Here's a technical hashtag for your issue: #issue_2AYOGeCk
I understand how difficult it is to distinguish between PMs and group chats. We've got something in mind. Stay tuned.