Perhaps you should try some spelling variations:
theo chieu » ho chieu, theo chu, thi chieu
hanh tang » hanh trang, hanh mang, hanh tung
dung cong » dung trong
anh tang » anh bang, anh dang, anh nang
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (theo tieu)) xanh - ((hanh tang) OR (anh tang)) va dung cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo tieu)) xanh - ((hanh tang) OR (anh tang)) va dung cong tan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo tieu)) xanh - ((hanh tang) OR (anh tang)) va dung cong tan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo tieu)) xanh - ((hanh tang) OR (anh tang)) va dung cong tan toan cao*.