Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
banh kem » banh keo, ban kem, sach kem
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, van chat
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, duc 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 ma hoi. hieu van cau ((tuc va) OR (tuc xa)) ((banh kem) OR (hanh kem)) cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. hieu van cau ((tuc va) or (tuc xa)) ((banh kem) OR (hanh kem)) cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu van cau ((tuc va) or (tuc xa)) ((banh kem) OR (hanh kem)) cua viet*.