Searching patents will avail new references making literature search and write up objective and knowing concepts and methods means the chemistry research will always be new and at its best.
Try google patent, though I don't know if the results will be international (Google is a USA company as you know)
https://www.google.com/?tbm=pts
Otherwise ,you'll need to look at the web pages for the various patent sites in the countries of interest. For China, you may need to look via www.baidu.com