Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
va tham » van tham, va thanh, va thuat
va cham » va chat
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang x hoi. hieu ((va tham) or (va cham)) luc ((ban thanh) OR (ban hanh)) vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu ((va tham) OR (va cham)) luc ((ban thanh) OR (ban hanh)) vi cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. hieu ((va tham) or (va cham)) luc ((ban thanh) OR (ban hanh)) vi cua viet*".