Perhaps you should try some spelling variations:
thanh trung » thanh tung
thien thanh » tien thanh, thi thanh, hien hanh
tien manh » tien anh, tien thanh, tieng anh
va duong » van duong, va tuong, va huong
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, vat dung, va ung

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

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