Lots files i created theres days can't be find in search result.

eg: i created a file named "97407-AE" in zoho write, and i saved. I can see the file when i click the folder in zoho doc. But when i search it in search bar "97407-AE", it shows: No Results found for "97407-AE". Why?

I can find the file named "476-DW" which i created on 12/17 with the same way. Any boday could help me and fix it?

Thank you.