Perhaps you should try some spelling variations:
"initial investment treaties series" » "initial investment strategies series", "initial investment activities series", "initial investment incentives series", "national investment treaties series", "capital investment treaties series", "initial investment textiles series", "initial investment theories series", "initial 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"initial investment treaties series\") OR (\"industrial development center survey\"))~".
• Removing quotes may allow a broader search: (( initial investment treaties series ) OR ( industrial development center survey ))~.
• Adding a wildcard symbol may retrieve word variants: (("initial investment treaties series") OR ("industrial development center survey"))*.