Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
vu sach » vu bach, su sach, vu khach
bo sach » co sach, hoc sach
hieu va » lieu va, hieu qua
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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: ((vu sach) OR (bo sach)) ky nang x hoi. hieu va cac ((xuc va) OR (luc va)) hanh vi cua viet~.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (bo sach)) ky nang x hoi. hieu va cac ((xuc va) or (luc va)) hanh vi cua viet*.