Perhaps you should try some spelling variations:
tenth » tenti, benth, teeth, tentih, texth, testh
beth » both, beta
tent » tenti, text, test
problem » problemas
problems » problemass, problemas
problema » problemasa, problemas
problemasa » problemasasa, problemassa, problemas, problemes, problematica

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