There are different Business Directories :

Try all different Business Directories offered by
Every Engine has different results,
Most companies are listed in serveral directories
but the results are not the same ...

find products
and order them directly (example Crystals, Swarowsky, Dresses)

Products via Amazon

Yellow Pages B2C
Business to Consumers
Companies froviding Products or Sevices for End Users
(example Cafe)

Yellow Pages B2B
Business to Business
Companies providing Products for Professionals
(example Manufacturer of machines for Cafes)

Gov Pages
Czech GovCzech Gov Search
this search engine goes through
all the Czech ministeries,
maybe the company you are looking for
has been mentioned.

Czech Company Registry Ministry of Finance in English in Czech

Other Countries
Phone Book of the
Phone Book of the
maybe the company you are looking for
can be found through the directory of another country

good luck ...