Perhaps you should try some spelling variations:
"multiple vaccines research : july 2013" » "multiple access research : july 2013", "multiple crises research : july 2013", "multiple faces research : july 2013", "multiple vaccine research : july 2013", "multiple practices research : july 2013", "multiple accidents research : july 2013"
"select climate research : july 2013" » "recent climate research : july 2013", "direct climate research : july 2013", "delegate climate research : july 2013"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("multiple vaccines research : july 2013") or ("select climate research : july 2013"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multiple vaccines research : july 2013") OR ("select climate research : july 2013")).
• Removing quotes may allow a broader search: (( multiple vaccines research : july 2013 ) or ( select climate research : july 2013 )).
• Adding a wildcard symbol may retrieve word variants: (("multiple vaccines research : july 2013") or ("select climate research : july 2013"))*.