Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
so sach » so sanh, bo sach, co sach
mai hoi » mai khoi, dai hoi, lai hoi
va dau » va dao
ma hoi » xa hoi, ma hoa, me hoi
va cau » van cau, va cac, va cao
di su » doi su, ki su, da su

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: so sach ky nang ((ma hoi) OR (mai hoi)). lieu ((va cau) OR (va dau)) duc va hanh di su triet~.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((ma hoi) or (mai hoi)). lieu ((va cau) or (va dau)) duc va hanh di su triet*.