Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
tang van » dang van, hoang van, trong van
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
tang va » trang va, thang va, tang vat

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) OR (thuoc sach)) - anh ((tang va) OR (tang van)) nhung cong tan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((toc sach) OR (thuoc sach)) - anh ((tang va) or (tang van)) nhung cong tan toan cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((toc sach) OR (thuoc sach)) - anh ((tang va) or (tang van)) nhung cong tan toan cao*.