Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
xuc tuan » duc thuan, quoc tuan, xuan tuan
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
anh hai » lanh hai, manh hai, anh thai
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang ((x ho) or (xa hoi)). ((hieu va) or (lieu va)) cam xuc tuan anh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ((x ho) OR (xa hoi)). ((hieu va) OR (lieu va)) cam xuc tuan anh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((x ho) or (xa hoi)). ((hieu va) or (lieu va)) cam xuc tuan anh hai cua tre*.