Perhaps you should try some spelling variations:
aerospace sciences » aerospace science, espace sciences, aerospace geoscience
aerospace studies » aerospace series, cyberspace studies, aerosol studies
aerospace testing » aerospace design
space studies » peace studies, surface studies

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: ((((((aerospace studies) OR (space studies))) OR (aerospace sciences))) OR (aerospace testing)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((aerospace studies) OR (space studies))) or (aerospace sciences))) or (aerospace testing))".
• Adding a wildcard symbol may retrieve word variants: ((((((aerospace studies) OR (space studies))) or (aerospace sciences))) or (aerospace testing))*.