Perhaps you should try some spelling variations:
"agriculturalist" » "agriculturalists", "agriculturist", "agriculturists", "agricultureist"
"agricultureist" » "agriculturist", "agriculturists", "agricultures"
"horticultural" » "horticulture", "multicultural"
"agricultural" » "agriculture"

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: (("agriculturalist" OR "agricultureist") OR ("horticultural" OR "agricultural")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"agriculturalist\" OR \"agricultureist\") or (\"horticultural\" or \"agricultural\"))".
• Removing quotes may allow a broader search: (( agriculturalist OR agricultureist ) or ( horticultural or agricultural )).
• Adding a wildcard symbol may retrieve word variants: (("agriculturalist" OR "agricultureist") or ("horticultural" or "agricultural"))*.