Perhaps you should try some spelling variations:
"farmer personal information series" » "farmer personal information services", "farmer personal informatics series", "farmer personal information service", "lager personal information series", "paper personal information series"
"senegal social irrigation system" » "senegal local irrigation system", "senegal scale irrigation system", "senegal social mitigation system", "senegal social irrigation systems", "senegal social irrigation water", "senegal social irrigation scheme", "bengal social irrigation system", "general social irrigation system", "senegalese social irrigation system"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("senegal social irrigation system") or ("farmer personal information series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("senegal social irrigation system") OR ("farmer personal information series"))*.
• Removing quotes may allow a broader search: (( senegal social irrigation system ) or ( farmer personal information series ))*.