Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
hanh dai » hanh tai, hanh dao, vanh dai
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
cua cu » cua chu, cua cau, cua su
x hoi » xa hoi, o hoi, x ho
o hoc » co hoc, mo hoc, so hoc

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