Thomson ONE Banker
When searching for a specific company's purchasing strategy, always check their 10K first. Rather than manually scanning the document, use the CtrlF Find feature and type in purchas (for purchasing, purchasers, purchased) to skip to the text that contains this word stem.

RDS Business Reference Suite
Choose Purchasing from the Concept Term drop down menu. Type in your company name or choose an industry.

If this does not work, type in (purchas*) and (company name or industry name) into the keywords box.

Factiva
Try this tip: type in company name near15 purchas* to search for the company name and purchas word stem WITHIN 15 words of one another