Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
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, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
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 ky nang xa hoi. hieu vien da truc va hanh ((vi cua) or (((vai cua) OR (hai cua)))) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. hieu vien da truc va hanh ((vi cua) OR (((vai cua) OR (hai cua)))) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang xa hoi. hieu vien da truc va hanh ((vi cua) or (((vai cua) OR (hai cua)))) triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. hieu vien da truc va hanh ((vi cua) or (((vai cua) OR (hai cua)))) triet*.