Perhaps you should try some spelling variations:
"toc sach cha me gioi co thong minh" » "toc sach cha me gioi co thong tin", "toc sach cha me gioi co hoang minh", "hoc sach cha me gioi co thong minh", "doc sach cha me gioi co thong minh", "thuoc sach cha me gioi co thong minh", "toc sach nha me gioi co thong minh", "toc sach che me gioi co thong minh", "toc sach ha me gioi co thong minh", "toc sach cha me gioi co trong minh", "toc sach cha me gioi co phong minh", "toc sach cha me gioi co tong minh", "toc sach cha me giai co thong minh", "toc sach cha ve gioi co thong minh", "toc sach cha me nguoi co thong minh"
"toc sach cha me gioi bo thong minh" » "toc sach cha me gioi bo thong tin", "toc sach cha me gioi bo hoang minh", "hoc sach cha me gioi bo thong minh", "doc sach cha me gioi bo thong minh", "thuoc sach cha me gioi bo thong minh", "toc sach nha me gioi bo thong minh", "toc sach che me gioi bo thong minh", "toc sach ha me gioi bo thong minh", "toc sach cha me gioi pho thong minh", "toc sach cha me gioi bo truong minh", "toc sach cha me gioi he thong minh", "toc sach cha me giai bo thong minh", "toc sach cha ve gioi bo thong minh", "toc sach cha me nguoi bo thong minh", "toc sach cha me gioi bon thong minh", "toc sach cha me gioi hoa thong minh", "toc sach cha me gioi hoi thong minh"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("toc sach cha me gioi co thong minh") OR ("toc sach cha me gioi bo thong minh"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"toc sach cha me gioi co thong minh\") OR (\"toc sach cha me gioi bo thong minh\"))".
• Removing quotes may allow a broader search: (( toc sach cha me gioi co thong minh ) OR ( toc sach cha me gioi bo thong minh )).
• Adding a wildcard symbol may retrieve word variants: (("toc sach cha me gioi co thong minh") OR ("toc sach cha me gioi bo thong minh"))*.