Perhaps you should try some spelling variations:
hieu vien » hieu viec, thieu nien, hieu tieng
hieu hien » bieu hien, dieu hien, chieu chien
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
tuc va » thuc va, truc va, tuc xa
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) OR (hieu hien)) cac tuc va hanh ((vi cua) or (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. ((hieu vien) OR (hieu hien)) cac tuc va hanh ((vi cua) OR (vai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang xa hoi. ((hieu vien) OR (hieu hien)) cac tuc va hanh ((vi cua) or (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. ((hieu vien) OR (hieu hien)) cac tuc va hanh ((vi cua) or (vai cua)) triet*.