Perhaps you should try some spelling variations:
va thuat » ky thuat, ki thuat, va thuc
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
va cham » va chat, va tham
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, ma hoa, me hoi
soc va » hoc va, loc va, doc va
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ((ma hoi) OR (xa hoi)). lieu ((va thuat) or (va cham)) soc va danh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((ma hoi) OR (xa hoi)). lieu ((va thuat) OR (va cham)) soc va danh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((ma hoi) OR (xa hoi)). lieu ((va thuat) or (va cham)) soc va danh vi su triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((ma hoi) OR (xa hoi)). lieu ((va thuat) or (va cham)) soc va danh vi su triet*.