Perhaps you should try some spelling variations:
"horticulturalists" » "horticulturists", "agriculturalists", "horticultureists"
"multiculturalist" » "multiculturalism", "multiculturalisme", "multiculturalismo"
"horticultural" » "horticulture", "agricultural"

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: (("horticulturalists" OR "multiculturalist") OR ("horticultural" OR "multicultural")).
• Removing quotes may allow a broader search: (( horticulturalists or multiculturalist ) or ( horticultural or multicultural )).
• Adding a wildcard symbol may retrieve word variants: (("horticulturalists" or "multiculturalist") or ("horticultural" or "multicultural"))*.