Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
su triet » su viet, su tien, ve triet
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
vien cac » vien bach, vien dai, vien da
nang xa » nang x, lang xa, nang ma
cac xuc » cam xuc, cac nuoc, chat xuc
su sach » so sach, vu sach
tu sach » thu sach, te sach, tu cach
den su » dan su, nen su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ky nang xa hoi. hieu vien cac xuc ((van hanh) OR (ban hanh)) den su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu vien cac xuc ((van hanh) OR (ban hanh)) den su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang xa hoi. hieu vien cac xuc ((van hanh) OR (ban hanh)) den su triet*".