Try to make your search as simple as possible:
Tricholaena will find all items including that sequence of letters.
Search results for "Tricholaena":
"Tricholaena delicatula" - Tricholaena monachne
"Tricholaena longiseta" - Melinis longiseta
"Tricholaena setifolia" - Melinis nerviglumis Savannah Grass