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