Ask HN: Which index funds are antifragile?
Does Vanguard (for example) offer some anticyclic funds with high risks, high returns? Something to invest, say, 5% our your savings, and to complement an 80% Vanguard S&P 500 and 15% bonds index fund?
The mix you decide on will be purely yours in the end, no one can guarantee any type of result. I recommend just doing your own research and market testing to see what works for your short and long term investment needs.
Just remember the higher the possible returns the bigger the risks are.
Funds like these might be of interest:
http://www.investopedia.com/articles/investing/090115/top-5-...
https://www.thestreet.com/story/13427689/1/these-3-etfs-will...
I don't own any of them, don't endorse them, etc., I just suspect you haven't been searching with the right terms.