Perhaps you should try some spelling variations:
manh trung » manh tung, thanh trung, manh hung
hieu cach » hieu cac, chieu sach, hieu ca
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
cong dan » cong san, cong tan, huong dan
va dung » van dung, va duong, vat dung
dan van » dang van, doan van, dao van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu cach - ((manh trung) or (anh huong)) va dung cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - ((manh trung) OR (anh huong)) va dung cong dan van ban*.