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

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

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