Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cua viet » hoa viet, cua vat, cua dieu
cham tuc » nham thuc, pham thuc, tham thuc
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
vu nang » vuc nang, va nang, vu dang
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
ca viet » va viet, co viet, hoa viet
tuc va » thuc va, truc va, tuc xa
v nang » va nang, van nang, voi nang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((v nang) OR (vu nang)) xa hoi. hieu van cham tuc va danh di ((cua viet) OR (ca viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((v nang) OR (vu nang)) xa hoi. hieu van cham tuc va danh di ((cua viet) or (ca viet))~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((v nang) OR (vu nang)) xa hoi. hieu van cham tuc va danh di ((cua viet) or (ca viet))*.