Perhaps you should try some spelling variations:
"19 australian integral equations" » "19 australian integrated equations", "19 australian bilateral equations", "19 australian federal equations", "10 australian integral equations", "9 australian integral equations", "1 australian integral equations"
"19 australian general equations" » "19 australian federal equations", "19 australian generic equations", "19 australian energy equations", "10 australian general equations", "9 australian general equations", "1 australian general equations"

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