Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien sach » kien sach, thien hach, chieu sach
dien sach » dien anh
dung cong » dung trong
trung va » truong va, trang va, trung ha
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
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 ((hien sach) or (dien sach)) - thanh trung va dung cong tan ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (dien sach)) - thanh trung va dung cong tan ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (dien sach)) - thanh trung va dung cong tan ((toan cau) or (toan ban))*.