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 case survey" » "industrial development bank survey", "industrial development a survey", "industrial development aid survey", "industrial development based survey", "industrial development can survey", "industrial development pulse 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 case survey"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("national investment agencies series") OR ("industrial development case survey")).
• Removing quotes may allow a broader search: (( national investment agencies series ) or ( industrial development case survey )).
• Adding a wildcard symbol may retrieve word variants: (("national investment agencies series") or ("industrial development case survey"))*.