Perhaps you should try some spelling variations:
van khanh » van thanh, van anh, van phan
hieu van » hieu va, thien van, lieu va
van chat » cao chat
van hanh » van thanh, ban hanh, van anh
chat xuc » chat huu, cam xuc, chao xu
tu sach » thu sach, su sach, te sach
nang co » nang cao, nang doc, nang noi
nang ro » nang ho, nang ra, nang rong
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 y ((nang ro) or (nang co)) hai. hieu van chat xuc ((van khanh) or (van hanh)) tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang ro) OR (nang co)) hai. hieu van chat xuc ((van khanh) OR (van hanh)) tri cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang ro) or (nang co)) hai. hieu van chat xuc ((van khanh) or (van hanh)) tri cua tre*.