Perhaps you should try some spelling variations:
commercial across » commercial crops, commercial actors, commercial crisis
based collective » banks collective, based reflective, based selective
earlier studies » early studies
across space » across species, across scales, across states
care studies » case studies, career studies, scale studies
space based » place based

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

• Performing a fuzzy search may retrieve terms with similar spellings: commercial across space based collective ((earlier studies) or (care studies)).~.
• If you are trying to use Boolean operators, they must be ALL CAPS: commercial across space based collective ((earlier studies) OR (care studies))..
• Adding a wildcard symbol may retrieve word variants: commercial across space based collective ((earlier studies) or (care studies)).*.