Perhaps you should try some spelling variations:
study industrial » early industrial
industrial base » industrial areas
norms regional » notes regional, does regional, norms national
nor regional » your regional, do regional, der regional
per regional » der regional, power regional, der regionale

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: study industrial base ((((norms regional) OR (nor regional))) OR (per regional)) disparities.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "study industrial base ((((norms regional) OR (nor regional))) or (per regional)) disparities.~".
• Adding a wildcard symbol may retrieve word variants: study industrial base ((((norms regional) OR (nor regional))) or (per regional)) disparities.*.