Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
nam thuc » nam thuoc, am thuc, nam thu
so viet » hoc viet
hieu ve » hieu va, hieu van
nang ho » nang hoc, nang co, tang ho
sac ky » cac ky, sai ky
ve nam » he nam, va nam, le nam
ho hoi » hoc hoi, hoa hoi, hoi hoi
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang ho hoi. hieu ve nam thuc ((ban thanh) OR (ban hanh)) di ((va thiet) or (so viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ho hoi. hieu ve nam thuc ((ban thanh) OR (ban hanh)) di ((va thiet) OR (so viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ho hoi. hieu ve nam thuc ((ban thanh) OR (ban hanh)) di ((va thiet) or (so viet))*".