Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van hanh » ban hanh, van anh, van ban
so sanh » do sanh
nam xuc » cam xuc, nam xua, nam thuc
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua
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 sanh) or (toc sach)) ky nang x hoi. hieu van nam xuc ((van hanh) OR (van thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sanh) OR (toc sach)) ky nang x hoi. hieu van nam xuc ((van hanh) OR (van thanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sanh) or (toc sach)) ky nang x hoi. hieu van nam xuc ((van hanh) OR (van thanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((so sanh) or (toc sach)) ky nang x hoi. hieu van nam xuc ((van hanh) OR (van thanh)) vi cua tre*.