Perhaps you should try some spelling variations:
"horticulturalist" » "horticulturalists", "horticulturist", "horticulturists", "horticultureist", "agriculturalist"
"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: (("horticulturalist" OR "multiculturalist") OR ("horticultural" OR "multicultural"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"horticulturalist\" or \"multiculturalist\") or (\"horticultural\" OR \"multicultural\"))*".
• Removing quotes may allow a broader search: (( horticulturalist or multiculturalist ) or ( horticultural OR multicultural ))*.