Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van nhan » van phan, van thanh, danh nhan
nhan luc » nang luc
hanh dai » hanh tai, hanh dao, vanh dai
sach va » sach xa, sach ha, sach dao
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sach v » sach y, sach 2, sach vay
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach v) OR (sach va)) nang xa hoi. hieu van nhan luc va hanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach v) OR (sach va)) nang xa hoi. hieu van nhan luc va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach v) OR (sach va)) nang xa hoi. hieu van nhan luc va hanh dai cua tre*.