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)

"\u201A": "'", 
  "\u201B": "'", 
  "\u201C": '"', 
  "\u201D": '"', 
  "\u201E": '"', 
  "\u201F": '"', 
  "\u00BC": "1/4", 
  "\u00BD": "1/2", 
  "\u00BE": "3/4", 
};
let normalizationRegex = null;
function normalize(text) {
  if (!normalizationRegex) {
    
    const replace = Object.keys(CHARACTERS_TO_NORMALIZE).join("");
    normalizationRegex = new RegExp(`[${replace}]`, "g");
  }
  return text.replace(normalizationRegex, function (ch) {
    return CHARACTERS_TO_NORMALIZE[ch];
  });
}
/**
 * @typedef {Object} PDFFindControllerOptions
 * @property {IPDFLinkService} linkService - The navigation/linking service.
 * @property {EventBus} eventBus - The application event bus.
 */
/**
 * Provides search functionality to find a given string in a PDF document.
 */
class PDFFindController {