The U.S. website for clinical trials is https://clinicaltrials.gov/. This registry includes trials in other countries so you can use it to search for trials in Spain and any other country. For our cancer, try searching cholangiocarcinoma, liver cancer, bile duct cancer and solid tumor to find trials for which you may qualify.
Often medical authorities outside the United States post a registry of clinical trials. I looked for Spain using my deficient Spanish skills and found the following: https://reec.aemps.es/reec/public/web.html – please check this carefully to be sure it belongs to an official government agency, but this site does seem to have information on some clinical trials for cholangiocarcinoma.
I hope you find some promising studies to look into. Each clinical trial on a registry should give a point of contact you can call or write to.