Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
chat xuc » chat huu, cam xuc, chao xu
tinh vai » tinh va, tinh hai, tinh bai
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
xuc may » xuc hay, truc may, phuc may
vai cua » dai cua, hai cua, lai 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: hoc sach y ((van xay) or (nang x)) hoi. hieu va chat xuc may tinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y ((van xay) OR (nang x)) hoi. hieu va chat xuc may tinh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach y ((van xay) or (nang x)) hoi. hieu va chat xuc may tinh vai cua tre*.