Perhaps you should try some spelling variations:
ngay luc » nhan luc, nay lua, ngay doc
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
xang xa » lang xa, mang xa, ang xa
cua tre » cua te, cuu tre, cua triet
ca dan » cac dan, ca dao
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

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) OR (co sach)) ty xang xa hoi. lieu va ((ngay luc) or (ngap lut)) ca dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ty xang xa hoi. lieu va ((ngay luc) OR (ngap lut)) ca dan vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) ty xang xa hoi. lieu va ((ngay luc) or (ngap lut)) ca dan vi cua tre*".