Perhaps you should try some spelling variations:
tenth » benth, teeth, tench, kenth, tenh, wenth
wenti » went, denti, senti
tenti » kenti, teni, wenti
tent » kent, ten, went
test » west, best
text » texto
problem » problema, problems
problemas » problemaas, problemsas

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 (tenti OR wenti)) OR (tent OR (test OR text))) (problem OR problemas)~".
• Adding a wildcard symbol may retrieve word variants: Hilbert's ((tenth OR (tenti OR wenti)) OR (tent OR (test OR text))) (problem OR problemas)*.