Perhaps you should try some spelling variations:
thanh thanh » nhanh thanh, thanh toan, thanh phan
thanh thang » nhanh thang, thanh hang, thanh toan
dung cong » dung trong
doc hieu » hoc thieu, hoc hien
cong tac » cong ty
tac hang » tac vang, bac thang, tac chong
hang cau » hang dau, hang ca, nhung cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (toc thieu)) xanh - ((thanh thang) OR (thanh thanh)) xay dung cong tac hang cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) xanh - ((thanh thang) OR (thanh thanh)) xay dung cong tac hang cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (toc thieu)) xanh - ((thanh thang) OR (thanh thanh)) xay dung cong tac hang cau*".