It is not proven that investing in any Fund can beat the broad indexes in the long term. A lot of funds boost their previous results when the SP 500 went 30% in the period this fund managed a 150% gain. All this sounds intriguing.
The reason why the fund has managed to beat the broad stock market is:

1. Luck
2. Increased Risk

The Luck part is often rationalized by skill. The fund manager is some sort of genius that is able to pick good deals just before they are starting a rocket journey into the heavens. You can pick the right stocks a couple of times, and you can be successful over a period of time, but most often it has shown that when that luck runs out the fund can take some serious hits.

It is possible to leverage any investment with Increased Risk. By using margin or options you can get the SP 500 to go increase twice or any other percentage more for each percentage in the underlying index. A good indicator for increased risk is by looking into a fund that has beaten the index during good times, and see how it did during bear markets. A good chance is that the fund lost more than the index in the bear market.