Perhaps you should try some spelling variations:
tranh cua » doanh cua, manh cua
ban huong » bang phuong, ban hang, anh huong
phan cong » thanh cong
hoi hieu » hoi phieu, hoi tieu, moi hieu
tap toan » tap doan, tap quan, bai toan
toan ban » van ban
ho hieu » ho chieu, nho hieu, co hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho hieu) or (hoi hieu)) lang - canh tranh cua ((ban huong) or (phan cong)) tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (hoi hieu)) lang - canh tranh cua ((ban huong) OR (phan cong)) tap toan ban.
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) or (hoi hieu)) lang - canh tranh cua ((ban huong) or (phan cong)) tap toan ban*.