When you are searching for regulation through the "Legal Foundations" service, the double quotation marks "" around your keywords would help to return the exact match.
For example, to search for the regulation: Industrial Solid Waste and Municipal Hazardous Waste, you may want to search for:
"Industrial Solid Waste and Municipal Hazardous Waste"
or
"Solid Waste and Municipal Hazardous"
the system would only return one exact result (as the screenshot below).
This English quotation marks "" feature works for other languages as well.