Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
san cuu » san cua, san huu, song cuu
thuc va » thuc vat, thuc dan, thuc day
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
ty nang » ky nang, ty hang, ly nang
cuu tre » cua tre, cau tren, cau treo
co hoi » co hoc, co loi
tuc va » truc va, tuc xa, duc va

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 ((ty nang) OR (ty xang)) co hoi. hieu ve chat ((tuc va) OR (thuc va)) thanh san cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ty nang) or (ty xang)) co hoi. hieu ve chat ((tuc va) OR (thuc va)) thanh san cuu tre~".
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) or (ty xang)) co hoi. hieu ve chat ((tuc va) OR (thuc va)) thanh san cuu tre*.