Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
luc gia » luoc gia, quoc gia, duc giao
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 chat ((luc gia) OR (duc 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 chat ((luc gia) OR (duc 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 chat ((luc gia) OR (duc gia)) thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) nang xa hoi. hieu ve chat ((luc gia) OR (duc gia)) thanh dai cua tre*.