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
find products and order them directly (example Whiskey, Computers, Shoes)

Product Yellow Pages by Amazon

Video about the Amazon Pop Up Store @ Cremerie de Paris
one of the World's most famous places for Brand Expos
and historic home of the Singapore Whitepages.

Find Products / Companies via Yellow Pages B2C
Yellow Pages Business to Consumers
Companies froviding Products or Sevices for End Users
(example Restaurant)

Find Products / Companies via Yellow Pages B2B
Pro Yellow Pages Business to Business
Companies from Singapore providing Products for Professionals
Singapore B2B marketplace
(example Machinery)

typical products from Singapore:
coming soon

Find Company Info via Financial Yellow Pages
Financial Infos
Contact Details
All kind of Companies from Singapore
Annual Reports for Companies listed
on the Singapore Stockmarket

Find Companies via Gov Pages
search through the Government
Government of Singapore
Singapore Gov Search
this search engine goes through
the Singapore Gov Portal
all the Singapore Ministeries,
maybe the company you are looking for
has been mentioned at some point.

Find Companies in other Countries
search in another country
Phone Book of the
Phone Book of the
Annuaire du
maybe the person you are looking for has moved
and can be cound through the directory of another country

good luck ...