I made small script for greasemonkey and chromium userscript, which can fix this trouble. May be useful to someone.
// ==UserScript==
// @name Panda3D Reference Fix
// @namespace ruPanada3D
// @description Fix search results on Panda3D 1.8.1 reference
// @include *panda3d.org/reference/1.8.1/*
// @include *panda3d.org/reference/devel/*
// @match *panda3d.org/reference/1.8.1/*
// @match *panda3d.org/reference/devel/*
// @version 1
// @grant none
// ==/UserScript==
elems = document.getElementsByClassName("SREntry");
for(var i in elems){
if (elems[i].innerHTML){
elems[i].innerHTML = elems[i].innerHTML.replace(/_1_1/g, ".");
}
}