Perhaps you should try some spelling variations:
"national policy meteorological services" » "national policy meteorological stations", "national policy methodological services", "national world meteorological services", "national 4 micrometeorological services", "national poverty meteorological services"
"international rent economic survey" » "international arena economic survey", "international event economic survey", "international real economic survey", "international rent economic surveys", "international rent economic security", "international rent economic studies", "international recent economic survey", "international great economic survey", "international next economic survey"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("national policy meteorological services") or ("international rent economic survey"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("national policy meteorological services") OR ("international rent economic survey")).
• Removing quotes may allow a broader search: (( national policy meteorological services ) or ( international rent economic survey )).
• Adding a wildcard symbol may retrieve word variants: (("national policy meteorological services") or ("international rent economic survey"))*.