Perhaps you should try some spelling variations:
"Hilbert's bento problem" » "Hilbert's benton problem", "Hilbert's bentos problem", "Hilbert's lento problem"
"Hilbert's tenti problem" » "Hilbert's texti problem", "Hilbert's testi problem", "Hilbert's kenti problem"
"Hilbert's tent problems" » "Hilbert's text problems", "Hilbert's test problems", "Hilbert's kent problems", "Hilbert's tent problemas", "Hilbert's tent 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 bento problem") OR ("Hilbert's tenti problem"))) OR ("Hilbert's tent problems"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"Hilbert's bento problem\") OR (\"Hilbert's tenti problem\"))) OR (\"Hilbert's tent problems\"))".
• Removing quotes may allow a broader search: (((( Hilbert's bento problem ) OR ( Hilbert's tenti problem ))) OR ( Hilbert's tent problems )).
• Adding a wildcard symbol may retrieve word variants: (((("Hilbert's bento problem") OR ("Hilbert's tenti problem"))) OR ("Hilbert's tent problems"))*.