Perhaps you should try some spelling variations:
"Hilbert's tenth problem" » "Hilbert's benth problem", "Hilbert's teeth problem", "Hilbert's tench problem", "Hilbert's texth problem", "Hilbert's testh problem", "Hilbert's kenth problem"
"Hilbert's tent problem" » "Hilbert's text problem", "Hilbert's test problem", "Hilbert's kent problem"
"Hilbert's tenti problem" » "Hilbert's texti problem", "Hilbert's testi problem", "Hilbert's kenti problem"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"Hilbert's tenth problem\") OR (\"Hilbert's tent problem\"))) OR (\"Hilbert's tenti problem\"))~".
• Removing quotes may allow a broader search: (((( Hilbert's tenth problem ) OR ( Hilbert's tent problem ))) OR ( Hilbert's tenti problem ))~.
• Adding a wildcard symbol may retrieve word variants: (((("Hilbert's tenth problem") OR ("Hilbert's tent problem"))) OR ("Hilbert's tenti problem"))*.