Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
van hoi » van hoa, van hoe, van loi
van hoc » van hoa
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
vi hoa » voi hoa, vi hoc, va hoa

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: su sach ky tang ((van hoi) OR (van hoc)). ((hieu ve) OR (lieu va)) cham tuc va hanh vi hoa viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang ((van hoi) OR (van hoc)). ((hieu ve) or (lieu va)) cham tuc va hanh vi hoa viet~".
• Adding a wildcard symbol may retrieve word variants: su sach ky tang ((van hoi) OR (van hoc)). ((hieu ve) or (lieu va)) cham tuc va hanh vi hoa viet*.