Perhaps you should try some spelling variations:
tenth » benth, teeth, tench, texth, kenth, tenh
test » text, west, best
beth » both, beta
tenti » texti, kenti, teni
tent » text, kent, ten
problem » problema
problemas » problemaas
problems » problemas, 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 ((((tenth OR tenti) OR test) OR beth) OR tent) ((problem OR problemas) OR problems)~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "Hilbert's ((((tenth OR tenti) OR test) OR beth) OR tent) ((problem OR problemas) OR problems)".
• Adding a wildcard symbol may retrieve word variants: Hilbert's ((((tenth OR tenti) OR test) OR beth) OR tent) ((problem OR problemas) OR problems)*.