Perhaps you should try some spelling variations:
"eso astrophysics symposia, european county observatory" » "eso astrophysics symposia, european coude observatory", "eso astrophysics symposia, european boundary observatory", "eso astrophysics symposia, european acoustic observatory", "from astrophysics symposia, european county observatory", "dust astrophysics symposia, european county observatory", "moon astrophysics symposia, european county observatory", "eso astrophysics symposia, european country observatory", "eso astrophysics symposia, european counter observatory", "eso astrophysics symposia, european court observatory"
"nasa astrophysics symposia, european youth observatory" » "plasma astrophysics symposia, european youth observatory", "ray astrophysics symposia, european youth observatory", "wave astrophysics symposia, european youth observatory", "nasa astrophysics symposia, european bath observatory", "nasa astrophysics symposia, european coude observatory", "nasa astrophysics symposia, european southern observatory"

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: (("nasa astrophysics symposia, european youth observatory") OR ("eso astrophysics symposia, european county observatory")).
• Removing quotes may allow a broader search: (( nasa astrophysics symposia, european youth observatory ) or ( eso astrophysics symposia, european county observatory )).
• Adding a wildcard symbol may retrieve word variants: (("nasa astrophysics symposia, european youth observatory") or ("eso astrophysics symposia, european county observatory"))*.