Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
bai cua » ban cua, bai ca, hai cua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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 v nang ((x hoi) or (o hoi)). hieu ve cham duc va hanh ((bai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang ((x hoi) OR (o hoi)). hieu ve cham duc va hanh ((bai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach v nang ((x hoi) or (o hoi)). hieu ve cham duc va hanh ((bai cua) or (dai cua)) tre*.