Here, i have attached the PDF, that PDF document contains "Nudi" as an embedded font. When i searching the particular word (that in Nudi font), the search result selecting the word that context next to the exact word.

Link to PDF file (or attach file here):
[sample_pdf.zip](https://github.com/mozilla/pdf.js/files/229582/sample_pdf.zip)

Configuration:
- Web browser and its version: Mozilla 45.0.2
- Operating system and its version: Windows 7
- PDF.js version: 1.4.20-disc

What is the expected behavior? (add screenshot)
![find_01](https://cloud.githubusercontent.com/assets/17423938/14704922/c2e67f2c-07d4-11e6-9320-9aed2578d377.png)

}
    return true;
  }
  /**
   * Helper for multi-term search that fills the `matchesWithLength` array
   * and handles cases where one search term includes another search term (for
   * example, "tamed tame" or "this is"). It looks for intersecting terms in
   * the `matches` and keeps elements with a longer match length.
   */
  _prepareMatches(matchesWithLength, matches, matchesLength) {
    function isSubTerm(currentIndex) {
      const currentElem = matchesWithLength[currentIndex];
      const nextElem = matchesWithLength[currentIndex + 1];
      
      if (
        currentIndex < matchesWithLength.length - 1 &&
        currentElem.match === nextElem.match
      ) {
        currentElem.skipped = true;
        return true;
      }
      
      for (let i = currentIndex - 1; i >= 0; i--) {
        const prevElem = matchesWithLength[i];
        if (prevElem.skipped) {
          continue;
        }
        if (prevElem.match + prevElem.matchLength < currentElem.match) {
          break;
        }