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
dai xuc » dai luoc, dai thuc, dai truc
va hanh » van hanh, va thanh, va danh
dai xu » dai tu, dao xu, hai 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 ((dai xuc) OR (dai 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 ((dai xuc) or (dai xu)) va hanh ((vi cua) or (dai cua)) tre*.