Perhaps you should try some spelling variations:
"practical nuclear test _ treaty" » "practical nucleic test _ treaty", "practice nuclear test _ treaty", "fractional nuclear test _ treaty"
"tactical nuclear test a treaty" » "statistical nuclear test a treaty", "clinical nuclear test a treaty", "national nuclear test a treaty", "tactical nuclear test act 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 _ treaty") OR ("tactical nuclear test a treaty")).
• Removing quotes may allow a broader search: (( practical nuclear test _ treaty ) or ( tactical nuclear test a treaty )).
• Adding a wildcard symbol may retrieve word variants: (("practical nuclear test _ treaty") or ("tactical nuclear test a treaty"))*.