Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu vien » hieu hien, hieu viec, hieu tieng
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
luc va » duc va, tuc va, loc va
vi cua » di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((hieu vien) OR (thieu nien)) da luc va hanh ((vi cua) OR (vai cua)) viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. ((hieu vien) or (thieu nien)) da luc va hanh ((vi cua) OR (vai cua)) viet~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu vien) or (thieu nien)) da luc va hanh ((vi cua) OR (vai cua)) viet*.