Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
ve triet » su triet
va trien » va truyen, va thiet, va tuyen
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hoc van » hoc dan, hoc vat, hoc phan
hanh ve » hanh vi, hanh va, hanh kem

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 xa hoi. hieu viec cac ((hoc van) OR (hoc va)) hanh ve ((ve triet) OR (va trien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu viec cac ((hoc van) or (hoc va)) hanh ve ((ve triet) OR (va trien))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu viec cac ((hoc van) or (hoc va)) hanh ve ((ve triet) OR (va trien))*.