Perhaps you should try some spelling variations:
van thanh » van tuan
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
te sach » toc sach
ty nang » ty xang, ty hang, ly nang
van bac » van ban, van bao, van hac
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: te sach ((ty nang) or (ky nang)) x hoi. hieu van bac bo ((van thanh) OR (ban thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ky nang)) x hoi. hieu van bac bo ((van thanh) OR (ban thanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) or (ky nang)) x hoi. hieu van bac bo ((van thanh) OR (ban thanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) or (ky nang)) x hoi. hieu van bac bo ((van thanh) OR (ban thanh)) vi cua tre*.