Perhaps you should try some spelling variations:
chieu chien » thien chien
hieu hien » bieu hien, dieu hien, dieu khien
chua tre » chua tri, cua tre, chua trieu
va dinh » van dinh, va tinh, vu dinh
ve chua » ve chuan, me chua, va chua
va kinh » va tinh, qua kinh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cac lao » ca lao, cac loai, cac giao
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: tu sach ky nang x hoi. ((hieu hien) OR (chieu chien)) cac lao ((va dinh) OR (va kinh)) ve chua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. ((hieu hien) or (chieu chien)) cac lao ((va dinh) OR (va kinh)) ve chua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. ((hieu hien) or (chieu chien)) cac lao ((va dinh) OR (va kinh)) ve chua tre*.