Perhaps you should try some spelling variations:
fertilizer trade » fertilizer trials, fertilizer type, fertilizer usage
technical report » technical support, technical experts, technical review
rich fertilizer » rice fertiliser, africa fertilizer, bio fertilizer
assessment el » assessment e6, assessment esw, assessment 1
assessment ii » assessment 1, assessment 3, assessment 16

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

• Performing a fuzzy search may retrieve terms with similar spellings: rich fertilizer trade ((assessment el) or (assessment ii)) technical report.~.
• If you are trying to use Boolean operators, they must be ALL CAPS: rich fertilizer trade ((assessment el) OR (assessment ii)) technical report..
• Adding a wildcard symbol may retrieve word variants: rich fertilizer trade ((assessment el) or (assessment ii)) technical report.*.