Perhaps you should try some spelling variations:
aerospace medicine » space medicine, aerospace geoscience
aerospace studies » cyberspace studies, space studies, aerosol studies
aerospace series » aerospace airlines, aerospace bearings, aerospace sciences

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 (aerospace series))) OR (aerospace medicine)).
• Adding a wildcard symbol may retrieve word variants: ((((aerospace studies) or (aerospace series))) or (aerospace medicine))*.