How To Fix Instagram Search Not Working

Only 9 results show up in hashtag search, why?

Thank you I made sure when it started working i came nack to like this video and like it :)

how to fix it in computer?

It's NONE of the reasons you mentioned; it's an evil action on the IG side.
I had this problem once — when using IG inside a Firefox browser on my desktop — and I found it out very easily: by establishing another IG account. Guess what? On my actual account still I wasn't able to do any search („No results found”) — while on the fresh account there was no problem. When I switched back to older account — „search” facility was blocked.
The very same machine, same network, same software, same time — just logging to different account was enough.
No, it's not app fault, no need to clear cache, not a „sluggish Internet” etc. — nothing like that — it's action of IG personnel. Next time try new „fresh” account.