Perhaps you should try some spelling variations:
"industrial development policies series" » "industrial development policy series", "industrial development projects series", "industrial development politics series"
"national investment treaties series" » "international investment treaties series", "capital investment treaties series", "national treatment treaties series", "national investment strategies series", "national investment activities series", "national investment incentives series", "national investment textiles series", "national investment theories series", "national investment forestiers series"

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 treaties series") or ("industrial development policies series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("national investment treaties series") OR ("industrial development policies series")).
• Removing quotes may allow a broader search: (( national investment treaties series ) or ( industrial development policies series )).
• Adding a wildcard symbol may retrieve word variants: (("national investment treaties series") or ("industrial development policies series"))*.