Perhaps you should try some spelling variations:
"national investment agencies series" » "international investment agencies series", "capital investment agencies series", "national treatment agencies series", "national government agencies series", "national investment policies series", "national investment treaties series"
"industrial development center survey" » "industrial development case survey", "industrial development agencies survey", "industrial development sector survey"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("national investment agencies series") or ("industrial development center survey"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("national investment agencies series") OR ("industrial development center survey")).
• Removing quotes may allow a broader search: (( national investment agencies series ) or ( industrial development center survey )).
• Adding a wildcard symbol may retrieve word variants: (("national investment agencies series") or ("industrial development center survey"))*.