Perhaps you should try some spelling variations:
"practical nuclear test act treaty" » "tactical nuclear test act treaty", "practical nucleic test act treaty", "practice nuclear test act treaty", "practical nuclear test last treaty", "practical nuclear test each treaty", "practical nuclear test any treaty"
"practical nuclear test a treaty" » "tactical nuclear test a treaty", "practical nucleic test a treaty", "practice nuclear test a treaty", "practical nuclear test _ treaty"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"practical nuclear test act treaty\") OR (\"practical nuclear test a treaty\"))".
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