Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
thong cong » trong cong, tong cong, thong thong
duong cong » dung cong, luong cong, duong trong
chi tach » chiu trach, chiet tach, chi thanh
toan van » tran van, toan ban, tan van
doan van » doan va, hoang van, luan van
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi tach - thanh toan van ((thong cong) or (duong cong)) doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi tach - thanh toan van ((thong cong) OR (duong cong)) doan van ban.
• Adding a wildcard symbol may retrieve word variants: doi chi tach - thanh toan van ((thong cong) or (duong cong)) doan van ban*.