You really have to think about it: how does one fix a match, how can a referee let one team win with a lot of goals?
Players mostly fix matches by losing with a larger difference then the bookies think. Losing is easier than winning. And they will do their losing as quickly as possible, that way they're sure of it. Take this match for instance.
For a referee to make one team win is another matter. It will show. There will be disallowed goals and penalties, there will be a red card for a good player. Think about it before you yell. It's not easy at all.