Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung thac » trung thuc, trung thanh, trang thach
thac quang » tac quang, thai quang, than quang
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien
dong van » duong van, dang van, dong von
toan ban » van ban
dong va » dung va, dong ha, luong va

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - thanh trung thac quang ((dong va) or (dong van)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - thanh trung thac quang ((dong va) OR (dong van)) toan ban.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - thanh trung thac quang ((dong va) or (dong van)) toan ban*.