Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
dai luoc » dai luong, khai luoc, dai hoc
can hanh » ban hanh, dan hanh, dang hanh
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
su tien » su kien, tu tieng, dau tien
su hien » su kien, thu hien, nhu hien

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 ((can hanh) OR (van hanh)) vi ((su tien) or (su hien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu vien dai luoc ((can hanh) OR (van hanh)) vi ((su tien) OR (su hien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu vien dai luoc ((can hanh) OR (van hanh)) vi ((su tien) or (su hien))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu vien dai luoc ((can hanh) OR (van hanh)) vi ((su tien) or (su hien))*.