Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
trung va » truong va, trung ha, trung tam
trang va » tran van, hang va
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan ban » van ban

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: ((doi chieu) OR (toc thieu)) xanh - thanh ((trung va) OR (trang va)) nhung cong tac toan ban~.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) xanh - thanh ((trung va) or (trang va)) nhung cong tac toan ban*.