Perhaps you should try some spelling variations:
thuc thanh » thuoc thanh, thuc hanh, phuc thanh
choi thuc » hoc thuc, hoi chuc, cho thue
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
dang va » dang van, dang vat, dung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: choi thuc thanh - hanh ((dang va) or (hang va)) dung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: choi thuc thanh - hanh ((dang va) OR (hang va)) dung cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: choi thuc thanh - hanh ((dang va) or (hang va)) dung cong dan than cau*.