Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh luc » thanh luu, than luc, nhan luc
van hanh » ban hanh, van anh, van ban
vuc nang » cuc nang, chuc nang, van nang
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
te sach » toc sach
vu nang » va nang, vu dang, v nang
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: te sach ((vu nang) OR (vuc nang)) xa hoi. hieu van 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) OR (vuc nang)) xa hoi. hieu van 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) OR (vuc nang)) xa hoi. hieu van thanh luc ((va danh) or (van hanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((vu nang) OR (vuc nang)) xa hoi. hieu van thanh luc ((va danh) or (van hanh)) vai cua tre*.