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I'm not the author of this CMS (FoolFuuka) and I'm not familiar enough on the system.
On theory it should be possible, but it's not as simple to be done as you'd think because I'd need to also modify the search engine.
You could ask 4plebs' admin on his site, he's quite skilled with this CMS and the search engine.
Personally I don't have the time to invest in to such a feature, sorry.