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 act treaty"
"tactical nuclear test _ treaty" » "statistical nuclear test _ treaty", "clinical nuclear test _ treaty", "national nuclear test _ treaty"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("practical nuclear test a treaty") OR ("tactical nuclear test _ treaty"))*.
• Removing quotes may allow a broader search: (( practical nuclear test a treaty ) or ( tactical nuclear test _ treaty ))*.