Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cho tre » cho thue
duc van » duc va, duc tan, duc manh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
duy anh » duc anh, thuy anh
ma hoi » mai hoi, xa hoi, ma hoa

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: tu sach ((duy anh) OR (duy khanh)) ma hoi. hieu va cham duc van hanh lai ((cho tre) OR (khoe tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((duy anh) or (duy khanh)) ma hoi. hieu va cham duc van hanh lai ((cho tre) OR (khoe tre))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((duy anh) or (duy khanh)) ma hoi. hieu va cham duc van hanh lai ((cho tre) OR (khoe tre))*.