write this into google
site:onehallyu.com "your username + keyword such as platinum token or game or whatever"
so if I was doing that, it would look exactly like this:
site:onehallyu.com free sungmin platinum
that's how i find my old threads that i've lost or forgotten about
sometimes you'll have to go through a few pages of results but you'll be able to find it
Thank you a lot for the tip!