Perhaps you should try some spelling variations:
tenth » teeth, tench, texth, testh, kenth
tent » text, test, kent
tenti » texti, testi, kenti
benth » bento, bench, bent
beth » both, beta
texti » textil, texto, text
problems » problemas
problema » problemas

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