Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
hanh tang » hanh trang, anh tang, hanh mang
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien
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 quang - 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 quang - hanh tang cua nhung cong ((dan than) OR (dan gian)) cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu quang - hanh tang cua nhung cong ((dan than) or (dan gian)) cau*.