Perhaps you should try some spelling variations:
africa fertilizer » affect fertilizer, rich fertilizer, from fertilizer
fertilizer usage » fertilizer use, fertiliser use, fertilizer type
usage assessment » stage assessment, image assessment, use assessment
technical report » technical support, technical experts, technical review
assessment el » assessment e6, assessment esw, assessment 1
el technical » real technical, der technical, ecm technical

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

• Performing a fuzzy search may retrieve terms with similar spellings: africa fertilizer usage assessment el technical report.~.
• Adding a wildcard symbol may retrieve word variants: africa fertilizer usage assessment el technical report.*.