There's no need for multiple shadows or anything fancy like that, you just have to offset your shadow in the negative y-axis.
For dark text on a light background:
text-shadow: 0px -1px 0px rgba(0, 0, 0, .75);
If you have a dark background then you can simply invert the color and y-position:
text-shadow: 0px 1px 0px rgba(255, 255, 255, 0.75);
Play around with the rgba values, the opacity, and the blur to get the effect just right. It will depend a lot on what color font and background you have, and the weightier the font, the better.