Perhaps you should try some spelling variations:
"international policy hydrological services" » "international policy meteorological services", "international poverty hydrological services", "international prices hydrological services", "national policy hydrological services", "international policy methodological services"
"international brief economic surveys" » "international relief economic surveys", "international border economic surveys", "international bridge economic surveys", "international tariff economic surveys", "international area economic surveys", "international drive economic surveys", "international brief economic 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: (("international policy hydrological services") OR ("international brief economic surveys"))~.
• Removing quotes may allow a broader search: (( international policy hydrological services ) or ( international brief economic surveys ))~.
• Adding a wildcard symbol may retrieve word variants: (("international policy hydrological services") or ("international brief economic surveys"))*.