Perhaps you should try some spelling variations:
africa fertilizer » affect fertilizer, rich fertilizer, from fertilizer
technical experts » technical expertise
fertilizer type » fertilizer use
assessment esw » assessment east, assessment e6, assessment egra
assessment el » assessment e6, assessment 1, assessment 3

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