Perhaps you should try some spelling variations:
danh sai » dung sai, danh bat, danh dau
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cac toc » cac toi, cac nuoc, cac thoi
toc nam » hoc nam, oc nam, goc nam
dan sai » doan sai, dan tai, dan giai
cua tre » cua te, cuu tre, cua triet

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 ky nang x ho. ((hieu qua) OR (lieu va)) cac toc nam ((dan sai) OR (danh sai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x ho. ((hieu qua) or (lieu va)) cac toc nam ((dan sai) OR (danh sai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x ho. ((hieu qua) or (lieu va)) cac toc nam ((dan sai) OR (danh sai)) cua tre*.