Perhaps you should try some spelling variations:
quan thanh » ban thanh, van thanh
doc chieu » doc hieu, doi chieu, hoc thieu
tran tuan » tran xuan, tran quang, tran thanh
dung cong » dung trong
cong tac » cong ty
tac tren » rac tren, tai tren, tap tren
tren cau » tren ca, tren cay, tren tau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc chieu) OR (toc thieu)) xanh - thanh ((tran tuan) or (quan thanh)) dung cong tac tren cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc chieu) OR (toc thieu)) xanh - thanh ((tran tuan) OR (quan thanh)) dung cong tac tren cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc chieu) OR (toc thieu)) xanh - thanh ((tran tuan) or (quan thanh)) dung cong tac tren cau".
• Adding a wildcard symbol may retrieve word variants: ((doc chieu) OR (toc thieu)) xanh - thanh ((tran tuan) or (quan thanh)) dung cong tac tren cau*.