Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thuoc ban » thuoc tan, thuoc dang, thu ban
cua viet » ca viet, cua vat, cua dieu
thanh ve » hanh ve, thanh va, thanh vien
co sach » bo sach, cuon sach, hoc sach
va cham » va chat, va tham
cao hoi » cau hoi, co hoi, cao hoc
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach y nang cao hoi. hieu ((ve cam) or (va cham)) thuoc ban thanh ve ((cua viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach y nang cao hoi. hieu ((ve cam) OR (va cham)) thuoc ban thanh ve ((cua viet) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: co sach y nang cao hoi. hieu ((ve cam) or (va cham)) thuoc ban thanh ve ((cua viet) or (hoa viet))*.