Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
xuc va » tuc va, luc va, xac va
di cua » dai cua, doi cua, de 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: so sach y nang xa hoi. hieu va cam ((xuc va) OR (duc va)) kinh ((vai cua) OR (di cua)) viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. hieu va cam ((xuc va) OR (duc va)) kinh ((vai cua) or (di cua)) viet~".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. hieu va cam ((xuc va) OR (duc va)) kinh ((vai cua) or (di cua)) viet*.