Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
hanh di » hanh vi, hanh de, hang di
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
van dau » van dao, phan dau
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua

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 ty nang ma hoi. hieu van dau ((xuc va) OR (luc va)) hanh di cua viet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. hieu van dau ((xuc va) or (luc va)) hanh di cua viet*.