Perhaps you should try some spelling variations:
"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."
"supply hiv training services." » "supply hiv planning services.", "supply hiv banking services.", "supply v training services.", "supply 3 training services.", "supply 3.3 training services.", "supply how training services.", "supply chain training services.", "supply china training services."

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

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