Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
hanh lam » thanh lap, hanh kem, hanh va
lam chat » luan chat, cao chat, ly chat
chat tre » chay tren, chat tai, cho tre
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
lai hoi » dai hoi, lai hoa, lai roi
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty tang ((ma hoa) or (lai hoi)). hieu vu cham duc va hanh lam chat tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty tang ((ma hoa) OR (lai hoi)). hieu vu cham duc va hanh lam chat tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty tang ((ma hoa) or (lai hoi)). hieu vu cham duc va hanh lam chat tre*.