Perhaps you should try some spelling variations:
astronomy science » astronomy space, astronomy ancient
springer springe » spring spring, springer series
stronger science » stronger evidence, stronger guidance, frontier science
springer science » bigger science, dinner science, pioneer science
stronger stance » stronger state, stronger cancer, stronger starts
business model » business models
river science » driven science, laser science, cyber science
business mit » business men, business man

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((springer springe) OR (river science))) OR (((((((stronger science) OR (astronomy science))) OR (springer science))) OR (stronger stance)))) ((business mit) OR (business model)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((springer springe) or (river science))) or (((((((stronger science) OR (astronomy science))) or (springer science))) or (stronger stance)))) ((business mit) or (business model))".
• Adding a wildcard symbol may retrieve word variants: ((((springer springe) or (river science))) or (((((((stronger science) OR (astronomy science))) or (springer science))) or (stronger stance)))) ((business mit) or (business model))*.