Perhaps you should try some spelling variations:
africa fertilizer » affect fertilizer, rich fertilizer, from fertilizer
fertilizer trade » fertilizer trials, fertilizer type, fertilizer usage
trade assessment » rate assessment, trait assessment, trainer assessment
technical report » technical experts, technical review
assessment el » assessment e6, assessment esw, assessment 1

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