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 case survey" » "industrial development china survey", "industrial development based survey", "industrial development scale survey", "industrial development use 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: (("initial investment treaties series") OR ("industrial development case survey"))~.
• Removing quotes may allow a broader search: (( initial investment treaties series ) or ( industrial development case survey ))~.
• Adding a wildcard symbol may retrieve word variants: (("initial investment treaties series") or ("industrial development case survey"))*.