Perhaps you should try some spelling variations:
cong khong » cong thong, cong thuong, trong khong
cong huong » cong thuong, cong luong, cong hung
sang sach » mang sach, ban sach, sang tac
tranh cua » doanh cua, manh cua
doanh van » doan van, doanh va, doanh ban
hoc sang » hoc bang, hoc tang, hoc hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sang sach - canh tranh cua ((cong huong) or (cong khong)) doanh van thu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sang sach - canh tranh cua ((cong huong) OR (cong khong)) doanh van thu.
• Adding a wildcard symbol may retrieve word variants: hoc sang sach - canh tranh cua ((cong huong) or (cong khong)) doanh van thu*.