Perhaps you should try some spelling variations:
thanh tung » thanh cong
thanh toan » thanh hoa, thanh san, tinh toan
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
trinh han » trinh quan
nho hieu » nha hieu, nho sieu, nhu hieu
tung cua » trung cua, tuong cua, dung cua
cua dung » cua dang, cua dong, qua dung

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 - thanh tung cua dung cong ((trinh han) or (thanh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho hieu lang - thanh tung cua dung cong ((trinh han) OR (thanh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: nho hieu lang - thanh tung cua dung cong ((trinh han) or (thanh toan)) cau*.