Perhaps you should try some spelling variations:
thanh luc » thanh luu, than luc, nhan luc
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
vai cua » dai cua, hai cua, lai cua
va hanh » va thanh, va danh, ban hanh
te sach » toc sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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 v nang xa hoi. ((hieu van) OR (hieu va)) thanh luc ((va hanh) or (van hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang xa hoi. ((hieu van) OR (hieu va)) thanh luc ((va hanh) OR (van hanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang xa hoi. ((hieu van) OR (hieu va)) thanh luc ((va hanh) or (van hanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach v nang xa hoi. ((hieu van) OR (hieu va)) thanh luc ((va hanh) or (van hanh)) vai cua tre*.