Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
tu sach » su sach, te sach, tu cach
nam xua » nam cua, nam mua, nam qua
vai cua » dai cua, hai cua, lai cua
nam xuc » cam xuc, nam thuc, nam duoc
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
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: ((tu sach) or (thu sach)) tu nang xa hoi. hieu van ((nam xuc) or (nam xua)) ban hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) tu nang xa hoi. hieu van ((nam xuc) OR (nam xua)) ban hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) tu nang xa hoi. hieu van ((nam xuc) or (nam xua)) ban hanh vai cua tre*.