Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
su triet » su viet, su tien, ve triet
hien cac » thien cac, vien cac, hieu cac
tuc van » thuc van, truc van, tuc va
hang vi » hang va, hanh vi, khang voi
hang di » hang doi, hang dien, hang dich
so sach » so sanh, bo sach, hoc sach
nang xa » nang x, lang xa, nang ma
co sach » bo sach, cuon sach, hoc sach
cac tuc » cac toc, cac tu, cac tac
y nang » ky nang, ly nang, v nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (co sach)) y nang xa hoi. hieu hien cac tuc van ((hang di) or (hang vi)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) y nang xa hoi. hieu hien cac tuc van ((hang di) OR (hang vi)) su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) y nang xa hoi. hieu hien cac tuc van ((hang di) or (hang vi)) su triet*".