Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
van hoi » van hoc, van hoe, van loi
nam xuc » cam xuc, nam xua, nam thuc
va hanh » van hanh, va thanh, va danh
su viet » so viet
xuc va » duc va, tuc va, luc va
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ((van hoi) or (van hoa)). hieu van nam xuc va hanh vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((van hoi) OR (van hoa)). hieu van nam xuc va hanh vi su viet.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((van hoi) or (van hoa)). hieu van nam xuc va hanh vi su viet*.