"aaa bbb" matches texts including both "aaa" and "bbb".

Wamei (Japanese plant names) is obtained from
Yamanouchi, T., Shutoh, K., Osawa, T., Yonekura, K., Kato, S., Shiga, T. 2019.
A checklist of Japanese plant names
(https://www.gbif.jp/v2/activities/wamei_checklist.html)