How to win

I have done the game 3 times and am on my 4th go. I have not found any thieves and just seem to go back and forth and get more points but don't really go anywhere

I'm not sure that this is the version that I am playing but both I and my daughter and I have within the last 3 months started playing this game.

She has got 2 thieves - I have got all of the pieces but neither of us have completed the game - Help please????????????????????

Thanks