Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
su sach » so sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
vien da » vien dai, hien dai
da truc » dai truc, ba truc, doan truc
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
vu sach » vu bach, vu khach
vi 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 da truc va hanh ((vi cua) or (vai 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 da truc va hanh ((vi cua) OR (vai 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 da truc va hanh ((vi cua) or (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (su sach)) ty nang xa hoi. hieu vien da truc va hanh ((vi cua) or (vai cua)) triet*.