Perhaps you should try some spelling variations:
"eso astrophysics symposia, european country observatory" » "eso astrophysics symposia, european county observatory", "eso astrophysics symposia, european boundary observatory", "eso astrophysics symposia, european country observations", "from astrophysics symposia, european country observatory", "dust astrophysics symposia, european country observatory", "moon astrophysics symposia, european country observatory", "eso astrophysics symposia, europe country observatory", "eso astrophysics symposia, european countries observatory", "eso astrophysics symposia, european control observatory"
"nasa astrophysics symposia, european southern observatory" » "plasma astrophysics symposia, european southern observatory", "wave astrophysics symposia, european southern observatory", "space astrophysics symposia, european southern observatory", "nasa astrophysics symposia, europe southern observatory", "nasa astrophysics symposia, european software observatory", "nasa astrophysics symposia, european youth observatory"
"ray astrophysics symposia, european southern observatory" » "ray astrophysics symposia, europe southern observatory", "ray astrophysics symposia, european software observatory", "ray astrophysics symposia, european youth observatory", "_ astrophysics symposia, european southern observatory", "energy astrophysics symposia, european southern observatory"
"eso astrophysics symposia, european court observatory" » "eso astrophysics symposia, european county observatory", "eso astrophysics symposia, european core observatory", "eso astrophysics symposia, european coude observatory", "from astrophysics symposia, european court observatory", "dust astrophysics symposia, european court observatory", "moon astrophysics symposia, european court observatory"

Try widening your search to All Fields.

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