Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh va » hang va, hanh vi
vuc van » duc van, luc van, thuc van
xuc van » duc van, luc van, xuc ban
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
va cua » va chua, via cua, ca 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: su sach ty nang ma hoi. hieu ((van lam) OR (van nam)) ((xuc van) OR (vuc van)) hanh va cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ma hoi. hieu ((van lam) or (van nam)) ((xuc van) OR (vuc van)) hanh va cua viet~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoi. hieu ((van lam) or (van nam)) ((xuc van) OR (vuc van)) hanh va cua viet*.