Perhaps you should try some spelling variations:
"Hilbert's tent problems" » "Hilbert's en problemas", "Hilbert's current problems"
"Hilbert's benth problem" » "Hilbert's beth problem", "Hilbert's bento problem", "Hilbert's bench problem"
"Hilbert's tenth problems" » "Hilbert's tenti problems", "Hilbert's teeth problems", "Hilbert's tench problems"

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