Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
trong van » trong cac
tien anh » tieng anh, tien manh, dien anh
anh tang » anh bang, anh dang, anh nang
tang qua » tang quan, tang cua, tang quy
qua dung » quang dung, su dung, qua song
van toan » van tuan, van tan, van thanh
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((tien anh) or (thien thanh)) - anh tang qua dung trong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien anh) OR (thien thanh)) - anh tang qua dung trong van toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((tien anh) or (thien thanh)) - anh tang qua dung trong van toan cau*.