Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
dung cong » dung trong
nho hieu » nha hieu, nho sieu, nhu hieu
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: nho hieu lang - hanh tranh cua ((thong cong) or (dung cong)) san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho hieu lang - hanh tranh cua ((thong cong) OR (dung cong)) san van ban.
• Adding a wildcard symbol may retrieve word variants: nho hieu lang - hanh tranh cua ((thong cong) or (dung cong)) san van ban*.