Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
so sach » so sanh, bo sach, co sach
te sach » toc sach
nam xuc » cam xuc, nam xua, nam thuc
via cua » gia cua, gian cua, giau cua
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (te sach)) ky nang x hoi. hieu van nam xuc ((van hanh) OR (ban hanh)) via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (te sach)) ky nang x hoi. hieu van nam xuc ((van hanh) OR (ban hanh)) via cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (te sach)) ky nang x hoi. hieu van nam xuc ((van hanh) OR (ban hanh)) via cua tre".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (te sach)) ky nang x hoi. hieu van nam xuc ((van hanh) OR (ban hanh)) via cua tre*.