Perhaps you should try some spelling variations:
fertilizer usage » fertilizer use, fertiliser use, fertilizer type
usage assessment » stage assessment, image assessment, use assessment
rich fertilizer » rice fertiliser, africa fertilizer, bio fertilizer
ii technical » iii technical, vi technical, die technical
i technical » vi technical, 2 technical, 3 technical

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