Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
thien hach » thien thanh, hien hanh
theo sach » thuoc sach, te sach, theo lich
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong tan » cong tac, cong san, cong thanh
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: toc ((theo sach) OR (thien hach)) - canh tranh cua nhung cong tan van ban~.
• Adding a wildcard symbol may retrieve word variants: toc ((theo sach) or (thien hach)) - canh tranh cua nhung cong tan van ban*.