Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh vai » hanh va, hanh tai, hanh van
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
xay hoi » xa hoi, tay hoi, cay phoi
cam luc » cam xuc, cau luc
tu dang » thu dang, su dang, vu dang
van cam » van nam, van lam, van cau
luc va » duc va, tuc va, loc va

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: hoc sach ((tu dang) OR (tu dong)) xay hoi. hieu van cam luc va ((hanh vai) OR (hanh vi)) su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((tu dang) OR (tu dong)) xay hoi. hieu van cam luc va ((hanh vai) or (hanh vi)) su triet~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((tu dang) OR (tu dong)) xay hoi. hieu van cam luc va ((hanh vai) or (hanh vi)) su triet*.