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

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 _ ((technical report) or (technical experts)).~.
• If you are trying to use Boolean operators, they must be ALL CAPS: africa fertilizer trade assessment _ ((technical report) OR (technical experts))..
• Adding a wildcard symbol may retrieve word variants: africa fertilizer trade assessment _ ((technical report) or (technical experts)).*.