Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
theo trieu » theo tieu, theo chieu, thep tieu
tang vat » tang van, dang vat, bang vat
cong tan » cong tac, cong san, cong thanh
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban
tan van » tran van, tang van, luan van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo trieu tinh - anh ((tang vat) OR (tan van)) thong cong tan ((toan tai) OR (toan ban))~.
• Adding a wildcard symbol may retrieve word variants: theo trieu tinh - anh ((tang vat) or (tan van)) thong cong tan ((toan tai) or (toan ban))*.