Perhaps you should try some spelling variations:
"tu sach cha me nguoi co thong minh" » "tu sach cha me nguoi co thong tin", "tu sach cha me nguoi co hoang minh", "tu sach nha me nguoi co thong minh", "tu sach che me nguoi co thong minh", "tu sach ha me nguoi co thong minh", "tu sach cha ma nguoi co thong minh", "tu sach cha le nguoi co thong minh", "tu sach cha ke nguoi co thong minh", "tu sach cha me nguoi do thong minh", "tu sach cha me nguoi dao thong minh", "tu sach cha me nguoi moi thong minh", "tu sach cha me nguoi bo thong minh", "tu sach cha me nguoi co trong minh", "tu sach cha me nguoi co phong minh", "thu sach cha me nguoi co thong minh", "su sach cha me nguoi co thong minh", "tu cach cha me nguoi co thong minh"
"te sach cha me nguoi co thong minh" » "te sach cha me nguoi co thong tin", "te sach cha me nguoi co hoang minh", "te sach nha me nguoi co thong minh", "te sach che me nguoi co thong minh", "te sach ha me nguoi co thong minh", "te sach cha ma nguoi co thong minh", "te sach cha le nguoi co thong minh", "te sach cha ke nguoi co thong minh", "te sach cha me nguoi do thong minh", "te sach cha me nguoi dao thong minh", "te sach cha me nguoi moi thong minh", "te sach cha me nguoi bo thong minh", "te sach cha me nguoi co trong minh", "te sach cha me nguoi co phong minh", "toc sach cha me nguoi co thong minh"

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