Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
danh vai » danh sai, danh va, doanh van
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
cac loc » cac lop, cac toc, cac hoc
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
loc va » hoc va, luc va
x hoi » o hoi, x ho, 5 hoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ty nang ((x hoi) OR (xa hoi)). hieu ve cac loc va danh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) ty nang ((x hoi) or (xa hoi)). hieu ve cac loc va danh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) ty nang ((x hoi) or (xa hoi)). hieu ve cac loc va danh vai cua tre*.