Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo chieu » theo tieu, ho chieu, thi chieu
ganh nang » nganh nong, van nang, sach nang
theo chu » cho chu, chao chu, theo yeu
anh nang » anh bang, anh dang, anh sang
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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: ((theo chieu) OR (theo chu)) xanh - ((anh nang) OR (ganh nang)) va nhung cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo chu)) xanh - ((anh nang) OR (ganh nang)) va nhung cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo chu)) xanh - ((anh nang) OR (ganh nang)) va nhung cong tac toan cau*.