Try to make your search as simple as possible:
Liriope will find all items including that sequence of letters.
Search results for "Liriope":
"Liriope graminifolia" - Liriope spicata
"Liriope muscari var. exiliflor" - Liriope exiliflora
"Liriope platyphylla" - Liriope muscari
"Liriope spicatus" - Ophiopogon jaburan Vittatus