Perhaps you should try some spelling variations:
"su sach cha me gioi co thong minh" » "su sach cha me gioi co hoang minh", "su sach nha me gioi co thong minh", "su sach che me gioi co thong minh", "su sach ha me gioi co thong minh", "su sach cha me gioi bo thong minh", "su sach cha me gioi co trong minh", "su sach cha me gioi co phong minh", "so sach cha me gioi co thong minh", "vu sach cha me gioi co thong minh", "su sach cha me giai co thong minh", "su sach cha ve gioi co thong minh", "su sach cha me nguoi co thong minh"
"tu sach cha le nguoi co thong tin" » "tu sach nha le nguoi co thong tin", "tu sach che le nguoi co thong tin", "tu sach ha le nguoi co thong tin", "tu sach cha ly nguoi co thong tin", "tu sach cha lam nguoi co thong tin", "tu sach cha den nguoi co thong tin", "tu sach cha le nguoi do thong tin", "tu sach cha le nguoi dao thong tin", "tu sach cha le nguoi moi thong tin", "tu sach cha le nguoi bo thong tin", "tu sach cha le nguoi co trong tin", "tu sach cha le nguoi co phong tin", "thu sach cha le nguoi co thong tin", "te sach cha le nguoi co thong tin", "tu cach cha le nguoi co thong tin", "tu sach cua le nguoi co thong tin"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("tu sach cha le nguoi co thong tin") or ("su sach cha me gioi co thong minh"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("tu sach cha le nguoi co thong tin") OR ("su sach cha me gioi co thong minh")).
• Removing quotes may allow a broader search: (( tu sach cha le nguoi co thong tin ) or ( su sach cha me gioi co thong minh )).
• Adding a wildcard symbol may retrieve word variants: (("tu sach cha le nguoi co thong tin") or ("su sach cha me gioi co thong minh"))*.