Perhaps you should try some spelling variations:
"eau de mer / teneur d composed organiques" » "eau de mer / teneur d composes inorganiques", "eau de mer / teneur c composed organiques", "eau de mer / teneur a composed organiques", "eau de mer / teneur d.d composed organiques", "eau de mer / teneur de composed organiques", "eau de mer / teneur du composed organiques", "eau de mer / teneurs de composed organiques", "eaux de mer / teneur d composed organiques", "l'eau de mer / teneur d composed organiques"
"eau de mer / teneur _ composed organiques" » "eau de mer / teneur _ composes inorganiques", "eaux de mer / teneur _ composed organiques", "l'eau de mer / teneur _ composed organiques"
"eau de mer / teneur d composes organiques" » "eau de mer / teneur de composes organiques", "eau de mer / teneur des composes organiques", "eau de mer / teneur d composites organiques", "eau de mer / teneur du composes organiques", "eau de mer / teneurs de composes organiques", "eaux de mer / teneur d composes organiques", "l'eau de mer / teneur d composes organiques"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("eau de mer / teneur d composes organiques") OR ((("eau de mer / teneur d composed organiques") OR ("eau de mer / teneur _ composed organiques")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"eau de mer / teneur d composes organiques\") or (((\"eau de mer / teneur d composed organiques\") OR (\"eau de mer / teneur _ composed organiques\"))))".
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• Adding a wildcard symbol may retrieve word variants: (("eau de mer / teneur d composes organiques") or ((("eau de mer / teneur d composed organiques") OR ("eau de mer / teneur _ composed organiques"))))*.