Android : How to extract specific text not all text using iText?

i am trying to extract word "Needless" ( pdf link )

but getting whole text when i am extracting it so what should i do?

here is the way i am doing.

String strfile = Environment.getExternalStorageDirectory() + "/pk.pdf";
                StringBuilder sb = new StringBuilder();

                 PdfReader reader = null;
                    try {
                        reader = new PdfReader(strfile);
                    } catch (IOException e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }

                        for (int i = 1; i <= reader.getNumberOfPages(); i++) {
                            try {
                            //  System.out.println(PdfTextExtractor.getTextFromPage(reader, i));
                                data = sb.append(PdfTextExtractor.getTextFromPage(reader, i));
                                System.out.println(data + "\n"+"PDF VERSION: "+reader.getPdfVersion()+ "\n"+"File Length: "
                                +reader.getFileLength()+"\n"+"Info: "+reader.getInfo()+"\n"+"Require to Decrypt: "+reader.isEncrypted()
                                +"\n"+"EOF: "+reader.getEofPos()+"\n"+reader.getLastXref());



                            } catch (IOException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }
                       } 


                return data;

and this is taking too much time on device. so i don't want whole text? is this possible?