Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien sach » dien sach, kien sach, thien hach
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
cap ban » cap bang, can ban, lap ban
cac ban » cac dan, cac van, can ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sach - thanh trung ((cap ban) or (cac ban)) cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - thanh trung ((cap ban) OR (cac ban)) cong tan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - thanh trung ((cap ban) or (cac ban)) cong tan toan cao*.