Full Question
I need help or advice on how not to lose money after sending LC while buying from China, and on how to ensure that the contents of the shipment and the quality of products are as per the contract.

Answer
Sometimes the Letter of Credit states that funds will be transferred to the seller upon provision of Bill of Lading (meaning the goods are on the boat and ready to ship). However, if the seller shipped you a box of rocks, you wouldn’t know until after the payment was made. So make sure the terms of the LC protect you, and even more important - be sure to conduct your due diligence upfront and have 3rd party inspection in place to ensure that the items being shipped are what you actually ordered.

Here are some more resources explaining how to source safe:

How to lower my exposure to risk when sourcing?

Essential sourcing skills: Supplier Verification

Video 2: Evaluating Suppliers
Video 4: Project Management and Quality Control
Video 8: Avoiding Scams

Glad to help. Let me know how things work out for you.