Perhaps you should try some spelling variations:
"export data irrigation schemes." » "export data irrigation scheme.", "export data irrigation systems.", "export canal irrigation schemes.", "export water irrigation schemes.", "export spate irrigation schemes.", "export day irrigation schemes.", "import data irrigation schemes.", "export ratio irrigation schemes."
"support group banking series." » "support group banking services.", "support group banking service.", "support group banking crises.", "support from banking series.", "support grant banking series.", "support group lending series.", "support round banking series."

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: (("export data irrigation schemes.") OR ("support group banking series."))~.
• Removing quotes may allow a broader search: (( export data irrigation schemes. ) or ( support group banking series. ))~.
• Adding a wildcard symbol may retrieve word variants: (("export data irrigation schemes.") or ("support group banking series."))*.