Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu vien » hieu hien, hieu viec, hieu tieng
cac truc » cau truc, cac tru, cac trung
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua
te cua » tue cua, le cua, de cua

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

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