Perhaps you should try some spelling variations:
"Hilbert's tenth problem" » "Hilbert's tenti problem", "Hilbert's tent problem", "Hilbert's teeth problem"
"Hilbert's benth problem" » "Hilbert's beth problem", "Hilbert's bento problem", "Hilbert's bent problem"
"Hilbert's bench problem" » "Hilbert's berch problem", "Hilbert's beach problem", "Hilbert's bunch 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 benth problem\") OR (\"Hilbert's bench problem\"))))~".
• Removing quotes may allow a broader search: (( Hilbert's tenth problem ) OR ((( Hilbert's benth problem ) OR ( Hilbert's bench problem ))))~.
• Adding a wildcard symbol may retrieve word variants: (("Hilbert's tenth problem") OR ((("Hilbert's benth problem") OR ("Hilbert's bench problem"))))*.