Perhaps you should try some spelling variations:
"municipal investment treaties series" » "municipal investments treaties series", "municipal government treaties series", "initial investment treaties series", "municipal investment strategies series", "municipal investment activities series", "municipal investment incentives series"
"industrial development center series" » "industrial development case series", "industrial development agencies series", "industrial development center survey"

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

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