1) The higher the player salary is, the less likely the player will come in your team.
2) Buy players from a team that you a beating in the club rankings.
3) Players who are not in a team are likely to come in your team.
4) Make sure that other teams don't be greedy and don't take your money when you get carried away, to get a player you want.
5) Give good salary to the players you are going to buy.