Perhaps you should try some spelling variations:
"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"
"Hilbert's tenth problems" » "Hilbert's texth problems", "Hilbert's testh problems", "Hilbert's kenth problems", "Hilbert's benth problems", "Hilbert's teeth problems", "Hilbert's tench problems", "Hilbert's tenth problemas", "Hilbert's tenth problema"

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