Perhaps you should try some spelling variations:
duoc van » duoc va, duc van, duoc ban
cua viet » hoa viet, cua vat, cua dieu
lieu van » lieu va, hieu van, sieu van
nam duoc » nam thuoc, da duoc, dat duoc
hanh va » hanh vi
sach ty » sach y, sach tu, sach thu
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ca viet » va viet, co viet, hoa viet
ma hoi » mai hoi, xa hoi, ma hoa

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: so sach ty nang ma hoi. lieu van nam duoc van ((hanh va) OR (hang va)) ((cua viet) OR (ca viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang ma hoi. lieu van nam duoc van ((hanh va) or (hang va)) ((cua viet) OR (ca viet))~".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang ma hoi. lieu van nam duoc van ((hanh va) or (hang va)) ((cua viet) OR (ca viet))*.