Is it safe to order on Amazon/Ebay from China?

Shall I trust the order from Chinese supplier?
My friend told me be careful order anything from China especially nameless
supplier. She went to Vietnam and bought a lots of stuff from Korean stores. She thought everything she bought was Korean made products but it was all Chinese made products . She find out the store is owned by Chinese business operator and used korean name and korean language on their product and store name so to look appears it's from Korea, not from China. So why Chinese owner used Korean name? Simply Vietnamese people hate China so they are not buying from anything smell Chinese. I dunno some says don't order from the Chinese supplier or no difference order from US supplier.