Perhaps you should try some spelling variations:
"Hilbert's texth problem" » "Hilbert's texto problemas"
"Hilbert's tent problem" » "Hilbert's tenti problem", "Hilbert's text problem", "Hilbert's test problem"
"Hilbert's tenth problems" » "Hilbert's tentih problems", "Hilbert's texth problems", "Hilbert's testh problems", "Hilbert's tenti problems", "Hilbert's benth problems", "Hilbert's teeth 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 texth problem") OR ("Hilbert's tent problem"))) OR ("Hilbert's tenth problems"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"Hilbert's texth problem\") OR (\"Hilbert's tent problem\"))) OR (\"Hilbert's tenth problems\"))".
• Removing quotes may allow a broader search: (((( Hilbert's texth problem ) OR ( Hilbert's tent problem ))) OR ( Hilbert's tenth problems )).
• Adding a wildcard symbol may retrieve word variants: (((("Hilbert's texth problem") OR ("Hilbert's tent problem"))) OR ("Hilbert's tenth problems"))*.