Perhaps you should try some spelling variations:
"municipal investment treaties series" » "municipal investments treaties series", "municipal government treaties series", "municipal governments treaties series", "municipal investment strategies series", "municipal investment activities series", "municipal investment incentives series", "municipal investment textiles series", "municipal investment theories series", "municipal investment forestiers series"
"industrial development center survey" » "industrial development case survey", "industrial development sector survey", "industrial development center series"

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 survey"))~.
• Removing quotes may allow a broader search: (( municipal investment treaties series ) or ( industrial development center survey ))~.
• Adding a wildcard symbol may retrieve word variants: (("municipal investment treaties series") or ("industrial development center survey"))*.