Perhaps you should try some spelling variations:
thanh tay » thanh tai, thanh toan, thanh thuy
thanh tam » thanh tai, thanh nam, thanh toan
thu sach » tu sach, thuat sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
sach ty » sach y, sach tu, sach thu
mai hoi » mai khoi, dai hoi, lai hoi
ty tang » tay tang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty tang ((ma hoi) or (mai hoi)). hieu vu cham duc va ((thanh tam) or (thanh tay)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty tang ((ma hoi) OR (mai hoi)). hieu vu cham duc va ((thanh tam) OR (thanh tay)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty tang ((ma hoi) or (mai hoi)). hieu vu cham duc va ((thanh tam) or (thanh tay)) cua tre*.