Perhaps you should try some spelling variations:
ve triet » va trien
su triet » su viet, su tien
phan duc » pham duc, phan tu, phan dau
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
ve phan » va phan, ke phan, ve phat

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 ((ty nang) OR (ty hang)) xa hoi. hieu ve phan duc va hanh ve ((su triet) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ty hang)) xa hoi. hieu ve phan duc va hanh ve ((su triet) OR (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty hang)) xa hoi. hieu ve phan duc va hanh ve ((su triet) OR (ve triet))*.