Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh tranh » canh tranh, hanh trinh, hanh trang
theo sach » thuoc sach, te sach, theo lich
biet cach » bien canh, viet sach, bien cac
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong san » cong tac
hieu ca » hieu cac, hieu cua, hieu va
san van » tan van, luan van, tran van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((theo sach) or (((biet cach) or (hieu ca)))) - hanh tranh cua nhung cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((theo sach) OR (((biet cach) OR (hieu ca)))) - hanh tranh cua nhung cong san van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((theo sach) or (((biet cach) or (hieu ca)))) - hanh tranh cua nhung cong san van ban*.