Perhaps you should try some spelling variations:
thanh tung » thanh cong
phan thanh » pham thanh, ban thanh, van thanh
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 su » dung su, rung su, tang su

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