Perhaps you should try some spelling variations:
"astrophysics and space sciences february" » "astrophysics and space since february", "astrophysics and space shields february", "astrophysics and space sciences january", "astrophysics and surface sciences february"
"astrophysics and space science laboratory" » "astrophysics and surface science laboratory"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("astrophysics and space sciences february") OR ("astrophysics and space science laboratory")).
• Removing quotes may allow a broader search: (( astrophysics and space sciences february ) or ( astrophysics and space science laboratory )).
• Adding a wildcard symbol may retrieve word variants: (("astrophysics and space sciences february") or ("astrophysics and space science laboratory"))*.