Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham tuc » nham thuc, pham thuc, tham thuc
hanh vai » hanh vi, hanh va, hanh tai
sach ky » sac ky, sach ty, sach kem
cao hoi » co hoi, cao hoc, tao hoi
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
vai va » mai va, dai va, hai va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach y)) nang ((cao hoi) OR (cau hoi)). hieu van cham tuc va hanh vai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang ((cao hoi) OR (cau hoi)). hieu van cham tuc va hanh vai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang ((cao hoi) OR (cau hoi)). hieu van cham tuc va hanh vai va thiet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang ((cao hoi) OR (cau hoi)). hieu van cham tuc va hanh vai va thiet*.