Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
chat xuc » chat huu, cam xuc, chao xu
van chat » cao chat
lai hoi » dai hoi, lai hoa, lai roi
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
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: thu sach ty nang ((xa hoi) or (lai hoi)). hieu van chat xuc ((van hanh) or (ban hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ((xa hoi) OR (lai hoi)). hieu van chat xuc ((van hanh) OR (ban hanh)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ((xa hoi) or (lai hoi)). hieu van chat xuc ((van hanh) or (ban hanh)) vai cua tre*.