Perhaps you should try some spelling variations:
"environmental activists" » "environment activists", "environmental activity", "environmental activismo"
"environmental activista" » "environment activista", "environmental activity", "environmental activismo"
"environmental activistas" » "environment activistas", "environmental activitys", "environmental activismos"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("environmental activists") OR ("environmental activista"))) OR ("environmental activistas"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"environmental activists\") OR (\"environmental activista\"))) OR (\"environmental activistas\"))".
• Removing quotes may allow a broader search: (((( environmental activists ) OR ( environmental activista ))) OR ( environmental activistas )).
• Adding a wildcard symbol may retrieve word variants: (((("environmental activists") OR ("environmental activista"))) OR ("environmental activistas"))*.