Perhaps you should try some spelling variations:
"partial nuclear test ban treaty" » "particle nuclear test ban treaty", "particles nuclear test ban treaty", "practical nuclear test ban treaty", "partial nuclear test a treaty", "partial nuclear west bank treaty", "partial nuclear test bed treaty"
"partial nuclear test new treaty" » "particle nuclear test new treaty", "particles nuclear test new treaty", "practical nuclear test new treaty", "partial nuclear test new threat", "partial nuclear test new treatise", "partial nuclear best new treaty", "partial nuclear west new treaty", "partial nuclear last new treaty"
"partial nuclear test new threats" » "particle nuclear test new threats", "particles nuclear test new threats", "practical nuclear test new threats", "partial nuclear best new threats", "partial nuclear west new threats", "partial nuclear last new threats"

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: (("partial nuclear test ban treaty") OR ((("partial nuclear test new treaty") OR ("partial nuclear test new threats")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"partial nuclear test ban treaty\") or (((\"partial nuclear test new treaty\") OR (\"partial nuclear test new threats\"))))".
• Removing quotes may allow a broader search: (( partial nuclear test ban treaty ) or ((( partial nuclear test new treaty ) OR ( partial nuclear test new threats )))).
• Adding a wildcard symbol may retrieve word variants: (("partial nuclear test ban treaty") or ((("partial nuclear test new treaty") OR ("partial nuclear test new threats"))))*.