Perhaps you should try some spelling variations:
"_ development studies." » "_ development services.", "_ development strategies.", "_ development strategy."
"child development series." » "child development services.", "child development agencies.", "child development africa."
"world development series." » "world development services.", "world development agencies.", "world development africa."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("_ development studies.") or ((("child development series.") OR ("world development series."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("_ development studies.") OR ((("child development series.") OR ("world development series.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"_ development studies.\") or (((\"child development series.\") OR (\"world development series.\"))))".
• Removing quotes may allow a broader search: (( _ development studies. ) or ((( child development series. ) OR ( world development series. )))).
• Adding a wildcard symbol may retrieve word variants: (("_ development studies.") or ((("child development series.") OR ("world development series."))))*.