Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
su triet » su viet, ve triet
van anh » van thanh, tuan anh, van minh
hoc van » hoc dan, hoc va, hoc vat
cac hoc » cach hoc, cac hop, bac hoc
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
su tien » su kien, su hien, tu tieng
anh vi » hanh vi, anh va, anh ve

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