Perhaps you should try some spelling variations:
environmental federalism » environmental externality, environmental education
chemical applications » ecological applications, practical applications, credit applications
special application » specialized applications, empirical application, numerical application
water environmental » better environmental, state environmental, natural environmental

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((special application) OR (chemical applications)) (water environmental federalism)~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((special application) OR (chemical applications)) (water environmental federalism)".
• Adding a wildcard symbol may retrieve word variants: ((special application) OR (chemical applications)) (water environmental federalism)*.