Perhaps you should try some spelling variations:
"su sach cha me gioi can song minh" » "su sach cha me gioi can tong minh", "su sach cha me gioi can hoang minh", "su sach cha me gioi can thong minh", "su sach che me gioi can song minh", "su sach ha me gioi can song minh", "su sach cua me gioi can song minh", "su sach cha me gioi van song minh", "su sach cha me gioi cam song minh", "su sach cha me gioi cau song minh", "su sach cha me gioi can dong minh", "su sach cha me gioi con song minh", "so sach cha me gioi can song minh", "vu sach cha me gioi can song minh", "su sach cha me giai can song minh", "su sach cha me nguoi can song minh", "su sach cha moi gioi can song minh"
"tu sach nha ve gioi co thong tin" » "tu sach nha ve gioi bo thong tin", "tu sach nha ve gioi co trong tin", "tu sach nha ve gioi co phong tin", "thu sach nha ve gioi co thong tin", "te sach nha ve gioi co thong tin", "tu cach nha ve gioi co thong tin", "tu sach nha ve giai co thong tin", "tu sach nha vien gioi co thong tin", "tu sach nha van gioi co thong tin", "tu sach nha ve nguoi co thong tin", "tu sach nhat ve gioi co thong tin", "tu sach nhan ve gioi co thong tin", "tu sach nha va gioi co thong tin", "tu sach nha ve gioi co thong tinh"

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: (("su sach cha me gioi can song minh") or ("tu sach nha ve gioi co thong tin"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach cha me gioi can song minh") OR ("tu sach nha ve gioi co thong tin")).
• Removing quotes may allow a broader search: (( su sach cha me gioi can song minh ) or ( tu sach nha ve gioi co thong tin )).
• Adding a wildcard symbol may retrieve word variants: (("su sach cha me gioi can song minh") or ("tu sach nha ve gioi co thong tin"))*.