Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cham lo » cham o, cam lo, cham soc
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cao hoc » co hoc, cho hoc, chat hoc
tao hoi » tao khoi, tao boi, tay hoi
ty nang » ky nang, ty xang, ty hang
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
lo va » lo van, lao va, ly va

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 (tu sach)) ty nang ((tao hoi) or (cao hoc)). hieu ve cham lo va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ty nang ((tao hoi) OR (cao hoc)). hieu ve cham lo va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ty nang ((tao hoi) or (cao hoc)). hieu ve cham lo va hanh vai cua tre*.