Perhaps you should try some spelling variations:
"practical nuclear test a treaty" » "practical nucleic test a treaty", "practice nuclear test a treaty", "fractional nuclear test a treaty", "practical nuclear test _ treaty", "practical nuclear test act treaty"
"tactical nuclear test a treaty" » "statistical nuclear test a treaty", "clinical nuclear test a treaty", "national nuclear test a treaty", "tactical nuclear test _ treaty", "tactical nuclear test act treaty"

You may be able to get more results by adjusting your search query.

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