Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
hieu van » hieu va, thien van, lieu va
chat luc » chat xuc, chat lua, nhan luc
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
luc gia » luoc gia, duc gia, quoc gia
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: su ((sach ty) or (sach y)) nang xa hoi. ((hieu ve) OR (hieu van)) chat luc gia thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang xa hoi. ((hieu ve) OR (hieu van)) chat luc gia thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach y)) nang xa hoi. ((hieu ve) OR (hieu van)) chat luc gia thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) nang xa hoi. ((hieu ve) OR (hieu van)) chat luc gia thanh dai cua tre*.