Perhaps you should try some spelling variations:
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac tuc » cac tu, cac tac, cac nuoc
cac toc » cac toi, cac nuoc, cac thoi
va dung » van dung, va duong, vat dung
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. hieu va ((cac tuc) OR (cac toc)) va dung cho ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu va ((cac tuc) OR (cac toc)) va dung cho ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu va ((cac tuc) OR (cac toc)) va dung cho ((cua tre) or (cuu tre))*.