Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh van, thanh ha
thanh hai » thanh phan, thanh hoa, thanh san
cham duc » pham duc, cham soc, pham duy
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 duc gia ((thanh hai) 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 duc gia ((thanh hai) 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 duc gia ((thanh hai) or (thanh dat)) cua tre*.