Perhaps you should try some spelling variations:
"horticulturalist" » "horticulturalists", "horticulturist", "horticulturists", "multiculturalist"
"multiculturalist" » "multiculturalism", "multiculturalisme", "multiculturalismo"
"agriculturalist" » "agriculturalists", "agriculturists", "agriculturally"
"agriculturist" » "agriculturists", "agriculturalists", "agricultura"
"horticultural" » "multicultural"

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