Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
thanh tung » thanh cong
doi chieu » doc hieu, doi chi, ho chieu
tam duong » tam huong, tuan duong, thao duong
tam dung » tac dung, tan dung, am dung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan 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: ((theo chieu) OR (doi chieu)) xanh - thanh tung ((tam dung) OR (tam duong)) cong tac toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (doi chieu)) xanh - thanh tung ((tam dung) OR (tam duong)) cong tac toan tap~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doi chieu)) xanh - thanh tung ((tam dung) OR (tam duong)) cong tac toan tap*.