Perhaps you should try some spelling variations:
technical experts » technical expertise
fertilizer usage » fertilizer use, fertiliser use
fertilizer type » fertilizer use
assessment ii » assessment 1, assessment 3, assessment 16
ii technical » iii technical, i technical, vi technical

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

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