Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
dau thi » cau thi, dan thi, dao thi
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
tuc va » thuc va, truc va, duc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang xa hoi. lieu va cac ((tuc va) or (tuc xa)) dau thi ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang xa hoi. lieu va cac ((tuc va) OR (tuc xa)) dau thi ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. lieu va cac ((tuc va) or (tuc xa)) dau thi ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang xa hoi. lieu va cac ((tuc va) or (tuc xa)) dau thi ((cuu tre) OR (cua tre))*.