Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
hieu ve » hieu va, hieu van
hai cua » thai cua, hoi cua, lai cua
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
tu sach » thu sach, su sach, te sach
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
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 ((5 hoi) or (o hoi)). hieu ve cham duc va hanh ((hai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang ((5 hoi) OR (o hoi)). hieu ve cham duc va hanh ((hai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach v nang ((5 hoi) or (o hoi)). hieu ve cham duc va hanh ((hai cua) or (dai cua)) tre*.