Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va tham » van tham, va cham, va thuat
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
ma hoi » mai hoi, ma hoa, me hoi
vi su » va su, ve su, ki 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: su sach ky nang ((ma hoi) OR (xa hoi)). lieu ((va tham) OR (va thanh)) hoc va danh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((ma hoi) OR (xa hoi)). lieu ((va tham) or (va thanh)) hoc va danh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((ma hoi) OR (xa hoi)). lieu ((va tham) or (va thanh)) hoc va danh vi su triet*.