Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
nang mai » nang ma, nang tai, lang mai
va cham » va chat, va tham
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va
vi cua » vai cua, di 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: ((te sach) OR (su sach)) y nang mai hoi. hieu va cham ((soc va) OR (loc va)) hanh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (su sach)) y nang mai hoi. hieu va cham ((soc va) OR (loc va)) hanh vi cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (su sach)) y nang mai hoi. hieu va cham ((soc va) OR (loc va)) hanh vi cua viet*.