Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
luoc van » luoc va, luc van, luot van
luoc can » luc canh, hoc can, luoc dai
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hanh ve » hanh vi, hanh va, hanh kem
ve su » va 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 ky nang xa hoi. hieu vien dai ((luoc van) OR (luoc can)) hanh ve su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu vien dai ((luoc van) OR (luoc can)) hanh ve su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu vien dai ((luoc van) OR (luoc can)) hanh ve su triet*.