Perhaps you should try some spelling variations:
thieu quan » thieu quang, thien quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
hieu quan » hieu qua, lieu quan, thien quan
hanh tang » hanh trang, anh tang, hanh mang
cua nhung » va nhung
tang cua » mang cua, hang cua, tang luan
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu quan) or (thieu quan)) - hanh tang cua nhung cong ((dan than) or (dan gian)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu quan) OR (thieu quan)) - hanh tang cua nhung cong ((dan than) OR (dan gian)) cau.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu quan) or (thieu quan)) - hanh tang cua nhung cong ((dan than) or (dan gian)) cau*.