Perhaps you should try some spelling variations:
sang tao » hang tai
thu sach » thuat sach, thuoc sach, thu hoach
cham duc » pham duc, cham soc, pham duy
hanh tai » thanh tai, hang tai, han tai
tu sach » su sach, te sach, tu cach
ty sang » ty xang, ty hang, duy sang
tao hoi » tao khoi, tao boi, tay hoi
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
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: ((tu sach) or (thu sach)) ty sang tao hoi. hieu vu cham duc va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty sang tao hoi. hieu vu cham duc va hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ty sang tao hoi. hieu vu cham duc va hanh tai cua tre*.