Perhaps you should try some spelling variations:
hanh truong » hanh trong, anh truong, manh truong
thien hieu » thien nhien, thien chien, thien hue
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
ban thanh » ban hanh, ban hang
dai dung » dai duong, dan dung, mai dung
dan toan » van toan, dan than, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thien hieu lang - hanh truong dai dung cong ((dan toan) or (ban thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thien hieu lang - hanh truong dai dung cong ((dan toan) OR (ban thanh)) cau*.