Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
ty lang » tay lang, ty xang, tu lang
ty hang » ly hang, ty xang, thi hang
qua cac » cua cac
cac xuc » cam xuc, cac nuoc, chat xuc
va hanh » van hanh, va thanh, va danh
co viet » so viet, o viet, hoc viet
xuc va » duc va, tuc va, luc 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: su sach ((ty lang) OR (ty hang)) xa hoi. hieu qua cac xuc va hanh vi ((cua viet) OR (co viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty lang) OR (ty hang)) xa hoi. hieu qua cac xuc va hanh vi ((cua viet) or (co viet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty lang) OR (ty hang)) xa hoi. hieu qua cac xuc va hanh vi ((cua viet) or (co viet))*.