To be able to search for trademarks on Dhgate you must use acronyms so that Dhgate can show you what you are looking for, nowadays searching for trademarks on Dhgate is difficult, since the moderators cover the acronyms, since the sale of trademarks on Dhgate is not allowed.
Below is a list so you can find brands on Dhgate and their acronyms, with them you can find a wide variety of brands to buy. I make it clear that the purchase of imitations is illegal and may be penalized in your country, Official china is not responsible of the use that you can give it, it only informs of the different ways of buying to the users.