Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cham tuc » nham thuc, pham thuc, tham thuc
va thanh » gia thanh, va tinh, le thanh
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
vai cua » dai cua, hai cua, lai 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) or (co sach)) ky nang x hoi. hieu ve cham tuc ((va thanh) or (ban thanh)) vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky nang x hoi. hieu ve cham tuc ((va thanh) OR (ban thanh)) vai cua viet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky nang x hoi. hieu ve cham tuc ((va thanh) or (ban thanh)) vai cua viet*.