Perhaps you should try some spelling variations:
"support chennai integrating countries." » "support chennai importing countries.", "support chennai immigration countries.", "support chennai integrating culture.", "support china integrating countries.", "support change integrating countries.", "support when integrating countries.", "support chemical integrating countries."
"support spate irrigation schemes." » "support spate irrigation scheme.", "support spate irrigation systems.", "support scale irrigation schemes.", "support water irrigation schemes.", "support surge irrigation schemes.", "support state irrigation schemes.", "support stage irrigation schemes.", "support system irrigation schemes."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("support chennai integrating countries.") or ("support spate irrigation schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support chennai integrating countries.") OR ("support spate irrigation schemes.")).
• Removing quotes may allow a broader search: (( support chennai integrating countries. ) or ( support spate irrigation schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("support chennai integrating countries.") or ("support spate irrigation schemes."))*.