Howdy,
If there is music you would like to see here on chordie, and you have the links, you can ask that they be indexed. There is information about how to do that on the homepage under the resources tab.
The absence of Cavaquinho music on the site presently is likely that the instrument does not have as large a following in Europe and the rest of us are not as familiar with it as you might be living on the Southern Continent. Chances are that if the music was able to be indexed here, you could allow the software used to format music here on chordie, transpose and adjust the tunings for your Uke so you could print copies for your own studies.
Take Care, and Welcome to Chordie!!
Doug
"what is this quintessence of dust?" - Shakespeare