Perhaps you should try some spelling variations:
class history » crises history
green probes » green process, green prices, green projects
storms great » stories great, sports great, torts great
sdg targets » ndc targets
meat prices » wheat prices
great class » great crisis
dust » must, just

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( sdg targets ((green probes) or (meat prices)) history ) or ( dust storms great class history ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( sdg targets ((green probes) OR (meat prices)) history ) OR ( dust storms great class history )).
• Adding a wildcard symbol may retrieve word variants: (( sdg targets ((green probes) or (meat prices)) history ) or ( dust storms great class history ))*.