Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
cham loc » cham soc, chon loc, cham o
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
ty nang » ky nang, ty xang, ty hang
loc va » hoc va, luc va
cua te » cua tu
x hoi » xa hoi, o hoi, 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: ((te sach) OR (toc sach)) ty nang ((x hoi) OR (x ho)). hieu ve cham loc va hanh vai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty nang ((x hoi) OR (x ho)). hieu ve cham loc va hanh vai cua te~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty nang ((x hoi) OR (x ho)). hieu ve cham loc va hanh vai cua te*.