Perhaps you should try some spelling variations:
truong thanh » luong thanh, truong tran, tran thanh
yuan anhang » tun anhang, yuan chang
wang yuan » wang yuhan, wang yan, fang yuan
anhang c » anhang 1, anhang a, anhang i
yang lin » yang jin, wang lin, yang liang
yang li » yang xi, yang yi, tang li
c main » 1 main, 2 main, 3 main

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: wang yuan anhang c main ((((yang lin) OR (yang li))) OR (yang di)) truong thanh ;~.
• Adding a wildcard symbol may retrieve word variants: wang yuan anhang c main ((((yang lin) or (yang li))) or (yang di)) truong thanh ;*.