Try to make your search as simple as possible:
Helicia will find all items including that sequence of letters.
Search results for "Helicia":
"Helicia diversifolia" - Athertonia diversifolia
"Helicia erratica" - Helicia nilagirica
"Helicia prealta" - Floydia prealta
"Helicia whelanii" - Macadamia whelanii
"Helicia youngiana" - Triunia youngiana