Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh tung » thanh cong
dung cong » dung trong
tien anh » tieng anh, tien manh, dien anh
tan toan » tap toan, van toan, dan toan
tung va » trung va, tuong va, dung va
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: hoc ((thien thanh) or (tien anh)) - thanh tung va dung cong ((tan toan) or (tan tran)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (tien anh)) - thanh tung va dung cong ((tan toan) OR (tan tran)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) or (tien anh)) - thanh tung va dung cong ((tan toan) or (tan tran)) cao*.