Perhaps you should try some spelling variations:
experiments remarks » experimental remarks, experiments results, experiments related
world economics » world economic, world economy, food economics
oecd economies » oecd economic
remarks papers » remarks paper, remarks chapters, remarks part

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: ((world economics) OR (oecd economies)) experiments remarks papers.
• Adding a wildcard symbol may retrieve word variants: ((world economics) or (oecd economies)) experiments remarks papers*.