Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
nang luong » nang song
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
luong cua » huong cua, long cua, luong quan
cua nhung » va nhung
van toan » van tuan, van thanh, manh toan
van tan » van tuan, van ban, van tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu lang - nang luong cua nhung cong ((van toan) or (van tan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - nang luong cua nhung cong ((van toan) OR (van tan)) cau*.