Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
tu xang » ty xang, tu lang, tu quang
xang xa » lang xa, mang xa, ang xa
hai xuc » hai cuc, chat xuc, hai huoc
va hanh » van hanh, va thanh, va danh
hai xu » thai xu, hai vu, dai xu
vi cua » vai 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 tu xang xa hoi. hieu qua ((hai xuc) OR (hai xu)) va hanh ((vi cua) OR (dai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu xang xa hoi. hieu qua ((hai xuc) OR (hai xu)) va hanh ((vi cua) or (dai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: su sach tu xang xa hoi. hieu qua ((hai xuc) OR (hai xu)) va hanh ((vi cua) or (dai cua)) tre*.