Perhaps you should try some spelling variations:
phuong dung » thong dung, cuong dung, phuong hoang
trinh quan » tinh quang, trinh luat, trinh han
hieu lang » chieu sang, hieu quang, nhieu tang
trinh van » trinh han, trinh toan, dinh van
manh toan » thanh toan, tinh toan
nho hieu » nha hieu, nho sieu, nhu hieu

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

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