Perhaps you should try some spelling variations:
africa fertilizer » affect fertilizer, rich fertilizer, from fertilizer
fertilizer type » fertilizer use
type assessment » time assessment, style assessments, cycle assessment
esw technical » ets technical, law technical, new technical
ecm technical » ets technical, eaap technical, from technical

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "africa fertilizer type assessment ((esw technical) OR (ecm technical)) experts.~".
• Adding a wildcard symbol may retrieve word variants: africa fertilizer type assessment ((esw technical) OR (ecm technical)) experts.*.