Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
bach toc » bach tuoc, bac hoc, cac toc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
toc van » hoc van, toc san, tac van
hanh ve » hanh va, hanh kem
su hien » su kien, su tien, thu 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 bach toc van ((hanh ve) OR (hanh vi)) su hien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu vien bach toc van ((hanh ve) OR (hanh vi)) su hien".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu vien bach toc van ((hanh ve) OR (hanh vi)) su hien*.