Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
va cham » va chat
va tham » van tham, va thanh, va thuat
su viet » so viet
sach v » sach va, sach y, sach 2
ma hoi » mai hoi, xa hoi, me hoi
soc va » hoc va, loc va, doc va
v nang » va nang, vu nang, van nang
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 v nang ((ma hoi) or (ma hoa)). lieu ((va tham) OR (va cham)) soc va danh vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v nang ((ma hoi) OR (ma hoa)). lieu ((va tham) OR (va cham)) soc va danh vi su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach v nang ((ma hoi) or (ma hoa)). lieu ((va tham) OR (va cham)) soc va danh vi su viet".
• Adding a wildcard symbol may retrieve word variants: so sach v nang ((ma hoi) or (ma hoa)). lieu ((va tham) OR (va cham)) soc va danh vi su viet*.