If you are searching from the internet you need to use the right key words and can take some time to locate some info, if the supplier is well known and been in business some time should not be a problem, as many sales people from the company would enter their information for sales and soon the tracking become simple.
But most of the information or trsut towards any supplier you can feel by looking at the details from the websites and first contact via real time cimmunication.
As we are from UK and based in China you can contact us and i will help you make a head start free of charge, we can give you our first thoughts about the supplier within minutes. John