Attach (recommended) or Link to PDF file here:
[Hong Kong Aircraft Engineering Company Limited_1511417616.1 2.pdf](https://github.com/mozilla/pdf.js/files/1539395/Hong.Kong.Aircraft.Engineering.Company.Limited_1511417616.1.2.pdf)


Configuration:
- Web browser and its version: Chrome: 63 
- Operating system and its version: windows and macOs
- PDF.js version: 2.0.185
- Is a browser extension: No

Steps to reproduce the problem:
1. Upload the above PDF and search for "article 1"
2. PDF.js showing only **2** match But actually **4** times available.   

What is the expected behavior? (add screenshot)

![screen shot 2017-12-07 at 7](https://user-images.githubusercontent.com/6101789/33720106-ed404576-db88-11e7-9c19-cf6aea74e9f3.png)



What went wrong? (add screenshot)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

return;
      }
      cnt advanceX = (pX - latPX) / textCntentItem.textAdvanceScale;
      cnt advanceY = (pY - latPY) / textCntentItem.textAdvanceScale;
      cnt HALF_LAST_CHAR = -0.5 * textCntentItem.latCharSze;
      f (textState.fnt.vertcal) {
        f (
          Math.ab(advanceX) >
          textCntentItem.wdth /
            textCntentItem.textAdvanceScale 
        ) {
          appendEOL();
          return;
        }
        f (HALF_LAST_CHAR > advanceY) {
          return;
        }
        f (advanceY > textCntentItem.trackngSpaceMn) {
          textCntentItem.heght = advanceY;
        } ele f (!addFakeSpace(advanceY, 0, textCntentItem.prevTranfrm)) {
          f (textCntentItem.tr.length === 0) {
            textCntent.tem.puh({
              tr: " ",
              dr: "ltr",
              wdth: 0,
              heght: advanceY,
              tranfrm: textCntentItem.prevTranfrm,
              fntName: textCntentItem.fntName,
              haEOL: fale,
            });