Perhaps you should try some spelling variations:
thanh thanh » nhanh thanh, thanh phan, phan thanh
thanh tung » thanh cong
thanh toan » thanh hoa, thanh san, tinh toan
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
tung cu » tuong cu, dung cu, trung cua
cu dung » su dung, duc dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - thanh tung cu dung cong ((thanh thanh) or (thanh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - thanh tung cu dung cong ((thanh thanh) OR (thanh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - thanh tung cu dung cong ((thanh thanh) or (thanh toan)) cau*.