Perhaps you should try some spelling variations:
thanh trung » thanh tung
tang sach » mang sach, sang sach, nang sach
van duong » van dong, van dung, van phong
hoc tang » hoc bang, hoc tan, hoc tieng
tan dung » tran dung, tin dung, van dung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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 tang sach - thanh trung ((van duong) or (tan dung)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tang sach - thanh trung ((van duong) OR (tan dung)) cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc tang sach - thanh trung ((van duong) or (tan dung)) cong tac toan cau*.