Perhaps you should try some spelling variations:
"particle nuclear test ban treaty" » "particle number test ban treaty", "particles nuclei test ban treaty", "particle nucleation test ban treaty", "particle nuclear test a treaty", "particle nuclear west bank treaty", "particle nuclear test bed treaty"
"particles nuclear test ban treaty" » "particles nuclear test a treaty", "particles nuclear west bank treaty", "particles nuclear test bed 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: "((\"particle nuclear test ban treaty\") OR (\"particles nuclear test ban treaty\"))".
• Removing quotes may allow a broader search: (( particle nuclear test ban treaty ) OR ( particles nuclear test ban treaty )).
• Adding a wildcard symbol may retrieve word variants: (("particle nuclear test ban treaty") OR ("particles nuclear test ban treaty"))*.