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Pisearch supports all standardized charsets. You are using a proprietary charset like windows-1257. Pisearch recognized it as US-ASCII.

You should use standardized charsets like utf-8 and not such proprietary like windows-1257. With these one other (non-windows) operating systems can have trouble.

The special chars must only encoded right  ...

secam wrote: How to use different pisearch templates only by changing some variables?

You can use another template with {pisearch template="your_template.tpl"}