Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
dinh dai » dinh dat, sinh dai, dinh dao
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
ly hang » ly quang
van cau » van dau, van hau, van chat
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, xac va
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: tu sach ((y nang) OR (ly hang)) ma hoi. hieu van cau ((xuc va) OR (luc va)) dinh dai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (ly hang)) ma hoi. hieu van cau ((xuc va) OR (luc va)) dinh dai cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (ly hang)) ma hoi. hieu van cau ((xuc va) OR (luc va)) dinh dai cua viet*.