Java - Getting derived words from a given root in a file

I'm working on a project of Word Sense Disambiguation and I want to find all the occurrences in a file of a given root e.g. the root is "love" the programme will give us all the words in the file that is derived from "love" like lovely, loved... I did some work but I didn't get what I want!

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package partenn1;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class Partenn1 {

    public static void main(String[] args) {
        int c=0;
        String w = "tissue";

        try (BufferedReader br = new BufferedReader(new FileReader("D:/Sc46.txt")))
        {
            String line;
            while ((line = br.readLine()) != null)
            {
                String[] WrdsLine = line.split(" ");

                boolean findwrd = false;
                for( String WrdLine : WrdsLine )
                {
                    for (int a=0; a<WrdsLine.length; a++)
                    {
                        if ( WrdsLine[a].indexOf(w)!=0)
                        {
                            c++; //It's just a counter for verification of the numbre of the occ.
                            findwrd = true; 
                        }
                    }

                }
            }
            System.out.println(c);
        }
        catch (IOException e) {}
    }
}

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