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