Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tang vatn » tang van, dang van, tan van
theo toc » ho toc, thac toc, theo bo
toc sach » hoc sach, doc sach, thuoc sach
tang vat » tang van, dang vat, bang vat
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan tap » toan ban

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 toc sach - anh ((tang vat) OR (tang vatn)) nhung cong tan toan tap~.
• Adding a wildcard symbol may retrieve word variants: theo toc sach - anh ((tang vat) or (tang vatn)) nhung cong tan toan tap*.