Perhaps you should try some spelling variations:
luan phuong » lan phuong, quang phuong, doan phuong
phuong cong » phuong dong, phong cong, phung cong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh dong » anh dong, ha dong
anh dung » anh dong, anh huong, sach dung
san toan » van toan, manh toan, xuan toan
dan toan » van toan, dan than, manh toan
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - ((hanh dong) or (anh dung)) luan phuong cong ((san toan) OR (dan toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - ((hanh dong) OR (anh dung)) luan phuong cong ((san toan) OR (dan toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - ((hanh dong) or (anh dung)) luan phuong cong ((san toan) OR (dan toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((hanh dong) or (anh dung)) luan phuong cong ((san toan) OR (dan toan)) cau*.