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Civil transaction is a contract or a legal act unilaterally. Through civil transaction, subject establish rights and obligations to satisfy human needs. But civil transactions are not always effective course, there are civil transactions will be void if it is unsatisfy the legal conditions. When invalid civil transactions, the result is that the subject must restore the original state, return to each other what they have received. However in some cases, property - the object of civil transactions were originally brought to carry out another transaction with the third party and the third party totally goodwill and upright when joing in transactions there. In this case, they are called bona fide third party by legal. The problem is when the original civil transactions disabled, how rights of bona fide third party will be protected? Bona fide third person has been retained assets or must be returned to the owner, legal possessor...? These are legal issues that the author will clarify within this article.