Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
nay luc » nay lua, nang luc, nhan luc
doan vi » doan va, don vi, doan thi
cua tre » cuu tre, cua triet, dua tren
va nay » va ngay, va cay
luc va » duc va, tuc va, loc va
dan vi » don vi, dan va, gan vi
cua te » cua tu

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 ty xang xa hoi. lieu va nay luc va ((dan vi) OR (doan vi)) ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty xang xa hoi. lieu va nay luc va ((dan vi) OR (doan vi)) ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty xang xa hoi. lieu va nay luc va ((dan vi) OR (doan vi)) ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: so sach ty xang xa hoi. lieu va nay luc va ((dan vi) OR (doan vi)) ((cua tre) or (cua te))*.