Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh dung » thanh dung, anh dung, hanh dong
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
anh tang » anh bang, anh dang, anh nang
cua dung » cua dang, cua dong, qua dung
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat

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 manh - ((hanh dung) or (anh tang)) cua dung cong ((dan than) OR (dan chan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((hanh dung) OR (anh tang)) cua dung cong ((dan than) OR (dan chan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - ((hanh dung) or (anh tang)) cua dung cong ((dan than) OR (dan chan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((hanh dung) or (anh tang)) cua dung cong ((dan than) OR (dan chan)) cau*.