Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
thai cua » than cua, tai cuc, tri cua
su sach » so sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
vu sach » vu bach, vu khach
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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

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