Try to make your search as simple as possible:
Smilax will find all items including that sequence of letters.
Search results for "Smilax":
"Smilax Grandifolia" - Smilax regelii
"Smilax hispida" - Smilax tamnoides
"Smilax medica" - Smilax aristolochiifolia
"Smilax officinalis" - Smilax regelii
"Smilax ornata" - Smilax regelii