Perhaps you should try some spelling variations:
"a trade development activities series" » "a trade investment activities series", "a trade development practitioners series", "a software development activities series", "a trade development activity series", "a trade development activities across", "a trade development activities africa"
"cfaa clean development price declines" » "cfaa human development price declines", "cfaa urban development price declines", "cfaa clean development police declines", "cfaa clean development bric declines", "cfaa clean development pre declines", "canada clean development price declines", "cfaa clean development price decline", "cfaa clean development price declined"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("a trade development activities series") OR ("cfaa clean development price declines"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"a trade development activities series\") OR (\"cfaa clean development price declines\"))".
• Removing quotes may allow a broader search: (( a trade development activities series ) OR ( cfaa clean development price declines )).
• Adding a wildcard symbol may retrieve word variants: (("a trade development activities series") OR ("cfaa clean development price declines"))*.