Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
theo yeu » theo tieu, thiet yeu, theo chu
va thong » va thuong, va phuong, he thong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
va tong » va tuong, va trong, va cong

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 yeu)) xanh - thanh trung ((va tong) OR (va thong)) cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo yeu)) xanh - thanh trung ((va tong) OR (va thong)) cong tan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo yeu)) xanh - thanh trung ((va tong) OR (va thong)) cong tan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo yeu)) xanh - thanh trung ((va tong) OR (va thong)) cong tan toan cao*.