Stocks with falling prices can sometimes become good long-term buys. Market traders overreacting to short-term issues provide the classic buying opportunity that value investors look for. But falling prices usually happen for a reason, and there are just as many cases where real concerns about the underlying businesses justify the price drop and provide a fair warning that the stock is best avoided.

The three stocks featured here have been crashing lately and may head even lower. They are Medical Properties Trust (NYSE: MPW), C3.ai (NYSE: AI), and Vinfast Auto (NASDAQ: VFS). Here's why these three stocks may still be too risky to buy.

Medical Properties Trust should be a safer stock than it's proving to be. It's a real estate investment Trust (REIT), which means the company owns properties and generates revenue by collecting rent from tenants. As long as those tenants are doing well, Medical Properties' top and bottom lines are stable and consistent.

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Source Fool.com