Perhaps you should try some spelling variations:
regularity tests » regularity results, regularity aspects, regularity theory
regularity test » regularity list, regularity result, singularity test
regularity atst » regularity list, regularity after, regularity a

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

• If you are trying to use Boolean operators, they must be ALL CAPS: "((\"wiener ((((regularity test) OR (regularity tests))) OR (regularity atst))\") or (\"wiener ((((regularity test) OR (regularity tests))) OR (regularity atst))s\"))".
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((\\"wiener ((((regularity test) OR (regularity tests))) or (regularity atst))\\") or (\\"wiener ((((regularity test) OR (regularity tests))) or (regularity atst))s\\"))\"".
• Removing quotes may allow a broader search: (( wiener ((((regularity test) OR (regularity tests))) or (regularity atst)) ) or ( wiener ((((regularity test) OR (regularity tests))) or (regularity atst))s )).