Perhaps you should try some spelling variations:
"eso astrophysics symposia, european software observatory" » "eso astrophysics symposia, european software observation", "eso astrophysics symposia, european space observatory", "eso astrophysics symposia, european software laboratory", "from astrophysics symposia, european software observatory", "nasa astrophysics symposia, european software observatory", "dust astrophysics symposia, european software observatory"
"eso astrophysics symposia, european youth observatory" » "eso astrophysics symposia, european county observatory", "eso astrophysics symposia, european bath observatory", "eso astrophysics symposia, european coude observatory", "from astrophysics symposia, european youth observatory", "nasa astrophysics symposia, european youth observatory", "dust astrophysics symposia, european youth observatory"
"eso astrophysics symposia, european southern observatory" » "from astrophysics symposia, european southern observatory", "nasa astrophysics symposia, european southern observatory", "dust astrophysics symposia, european southern observatory"
"eso astrophysics symposia, europe southern observatory" » "from astrophysics symposia, europe southern observatory", "nasa astrophysics symposia, europe southern observatory", "dust astrophysics symposia, europe southern observatory"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("eso astrophysics symposia, european youth observatory") OR ((((("eso astrophysics symposia, european southern observatory") OR ("eso astrophysics symposia, europe southern observatory"))) OR ("eso astrophysics symposia, european software observatory")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"eso astrophysics symposia, european youth observatory\") or (((((\"eso astrophysics symposia, european southern observatory\") OR (\"eso astrophysics symposia, europe southern observatory\"))) or (\"eso astrophysics symposia, european software observatory\"))))".
• Removing quotes may allow a broader search: (( eso astrophysics symposia, european youth observatory ) or ((((( eso astrophysics symposia, european southern observatory ) OR ( eso astrophysics symposia, europe southern observatory ))) or ( eso astrophysics symposia, european software observatory )))).
• Adding a wildcard symbol may retrieve word variants: (("eso astrophysics symposia, european youth observatory") or ((((("eso astrophysics symposia, european southern observatory") OR ("eso astrophysics symposia, europe southern observatory"))) or ("eso astrophysics symposia, european software observatory"))))*.