Perhaps you should try some spelling variations:
fertilizer trade » fertilizer trials, fertilizer type, fertilizer usage
trade assessment » rate assessment, trait assessment, trainer assessment
bio fertilizer » bio fertilizers, from fertilizer, rich 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.

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