Perhaps you should try some spelling variations:
ly quang » le quang, vu quang
co sach » bo sach, cuon sach, hoc sach
tai cua » thai cua, tai cuc, tri cua
xa dinh » va dinh, ba dinh, ha dinh
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ly » sach y, sach lo, sach ty
ve cac » va cac, vien cac
va hoc » van hoc
va hoi » xa hoi, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ly quang ((va hoi) OR (va hoc)). hieu ve cac tuc ((xa dinh) or (xac dinh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ly quang ((va hoi) OR (va hoc)). hieu ve cac tuc ((xa dinh) OR (xac dinh)) tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ly quang ((va hoi) OR (va hoc)). hieu ve cac tuc ((xa dinh) or (xac dinh)) tai cua tre".
• Adding a wildcard symbol may retrieve word variants: co sach ly quang ((va hoi) OR (va hoc)). hieu ve cac tuc ((xa dinh) or (xac dinh)) tai cua tre*.