Perhaps you should try some spelling variations:
"19 australian general equations" » "19 australian federal equations", "19 australian generic equations", "19 australian genre equations", "19 australian integral equations", "10 australian general equations", "9 australian general equations", "1 australian general equations"
"_ australian general election" » "_ australian federal election", "_ australian generic election", "_ australian genre election", "_ australia general election", "_ australian general selection"
"1996 australian energy elections" » "1996 australian early elections", "1996 australian federal elections", "1996 australian army elections", "1996 australian energy electrons", "1996 australian energy reflections", "1996 australian energy electron", "16 australian energy elections", "1989 australian energy elections", "19th australian energy elections", "1996 australian energy selections"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("19 australian general equations") OR ("1996 australian energy elections"))) OR ("_ australian general election"))*.
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