Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
van hanh » ban hanh, van anh, van ban
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
te sach » toc sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
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: te sach vu nang x hoi. hieu ((van thanh) OR (ban thanh)) luc ((va danh) or (van hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach vu nang x hoi. hieu ((van thanh) OR (ban thanh)) luc ((va danh) OR (van hanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach vu nang x hoi. hieu ((van thanh) OR (ban thanh)) luc ((va danh) or (van hanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach vu nang x hoi. hieu ((van thanh) OR (ban thanh)) luc ((va danh) or (van hanh)) vai cua tre*.