Hi,
The feature "smart search" in Joomla is mostly there to provide an auto-completion during the search.
But the system does not handle too much entries in his index database (when you have thousand and products with hundred of words in your description, it creates millions elements in the index database).
The Joomla smart search also require special "finder" plugin...
We recommend you to use some search extension like "rokajaxsearch" which provide same kind of features but using the classical "search" plugins and not the special "finder" one.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.