Perhaps you should try some spelling variations:
"Hilbert's beth problem" » "Hilbert's body problem"
"Hilbert's tenth problem" » "Hilbert's tenti problem", "Hilbert's benth problem", "Hilbert's teeth problem", "Hilbert's tentih problem", "Hilbert's texth problem", "Hilbert's testh problem"
"Hilbert's tent problem" » "Hilbert's tenti problem", "Hilbert's text problem", "Hilbert's test problem"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("Hilbert's tenth problem") OR ("Hilbert's tent problem"))) OR ("Hilbert's beth problem"))~.
• 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 beth problem\"))".
• Removing quotes may allow a broader search: (((( Hilbert's tenth problem ) OR ( Hilbert's tent problem ))) OR ( Hilbert's beth problem )).
• Adding a wildcard symbol may retrieve word variants: (((("Hilbert's tenth problem") OR ("Hilbert's tent problem"))) OR ("Hilbert's beth problem"))*.