Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
tu sach » thu sach, su sach, te sach
va chat » van chat, va phat, cao chat
tai cua » thai cua, tai cuc, tri cua
han tai » hang tai, nhan tai, van tai
cua tre » cua te, cuu tre, cua triet
va cham » va tham
nang xa » nang x, lang xa, nang ma
xuc va » duc va, tuc va, luc va
va han » va phan, van han, va hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (hoc sach)) ky nang xa hoi. lieu ((va cham) OR (va chat)) xuc va han tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sach)) ky nang xa hoi. lieu ((va cham) OR (va chat)) xuc va han tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (hoc sach)) ky nang xa hoi. lieu ((va cham) OR (va chat)) xuc va han tai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ky nang xa hoi. lieu ((va cham) OR (va chat)) xuc va han tai cua tre*.