Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hanh cao » hanh cac, hanh cat, hanh cad
cham duc » pham duc, cham soc, pham duy
co sach » bo sach, cuon sach, hoc sach
va hanh » van hanh, va thanh, va danh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ky danh » ky anh, ky dang
su tien » su kien, su hien, tu tieng
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ky danh ((ma hoi) or (mai hoi)). hieu va cham duc va hanh cao ((ve triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ky danh ((ma hoi) OR (mai hoi)). hieu va cham duc va hanh cao ((ve triet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: co sach ky danh ((ma hoi) or (mai hoi)). hieu va cham duc va hanh cao ((ve triet) or (su tien))*.