Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hien tach » chiet tach, hien hanh, dien sach
dung cong » dung trong
tranh va » tranh van, trang va, trinh va
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
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 tach) or (thien hach))) or (vien bach)) - canh tranh va dung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hien tach) OR (thien hach))) OR (vien bach)) - canh tranh va dung cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((((hien tach) or (thien hach))) or (vien bach)) - canh tranh va dung cong dan than cau*.