Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hang cao » hoang cao, nang cao, hang ca
hanh vai » hanh vi, hanh va, hanh tai
hieu tuc » hieu thuc, hieu luc, hieu thuoc
ty hang » ly hang, ty xang, thi hang
cao hoi » cau hoi, co hoi, cao hoc
su sach » so sach, vu sach
cham lo » cham o, cam lo, cham hoi
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai 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: ((thu sach) or (su sach)) ty hang cao hoi. hieu tuc ((cham lo) OR (cham soc)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ty hang cao hoi. hieu tuc ((cham lo) OR (cham soc)) va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (su sach)) ty hang cao hoi. hieu tuc ((cham lo) OR (cham soc)) va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ty hang cao hoi. hieu tuc ((cham lo) OR (cham soc)) va hanh vai cua tre*.