Perhaps you should try some spelling variations:
tenth » teeth, tench, texth, testh, kenth
tent » text, test, kent
tenti » texti, testi, kenti
benth » beth, bench, bent
bento » benito, benton, bentos
problem » problemas
problems » problemass, problemas
problema » problemasa, problemas

You may be able to get more results by adjusting your search query.

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