Perhaps you should try some spelling variations:
comparative macroeconomic » comprehensive macroeconomic, comparative economics, alternative macroeconomic
macroeconomic series » macroeconomic theories, macroeconomic crises, macroeconomic systems
comparative economic » comparative genomic, comparative genomics
tank comparative » talk comparative, dark comparative, mutans comparative
world tank » world bank, world task, world tasks
world talk » world task, world tasks, world take
could » would

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: (( the world tank comparative macroeconomic series ) OR ( the ((world talk) OR (could talk)) comparative economic studies )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the world tank comparative macroeconomic series ) or ( the ((world talk) OR (could talk)) comparative economic studies ))".
• Adding a wildcard symbol may retrieve word variants: (( the world tank comparative macroeconomic series ) or ( the ((world talk) OR (could talk)) comparative economic studies ))*.