Perhaps you should try some spelling variations:
"import duties international social." » "import duties international society.", "import duties international sourcing.", "import duties international seminar.", "import studies international social.", "import parties international social.", "import dutch international social."
"supply canal irrigation schemes." » "supply canal irrigation scheme.", "supply canal irrigation systems.", "supply scale irrigation schemes.", "supply canada irrigation schemes.", "supply annual irrigation schemes.", "supply china irrigation schemes."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply canal irrigation schemes.") or ("import duties international social."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply canal irrigation schemes.") OR ("import duties international social."))*.
• Removing quotes may allow a broader search: (( supply canal irrigation schemes. ) or ( import duties international social. ))*.