Trekking in tropical forest near border to Vietnam/Nanning

As I hope for warmer climate and more forest than in Guilin area, I am looking for a guided trekking tour (5 days) inside the tropical forest near the border to Vietnam end of december. But I didn't have any success by web research- there are no tours offered by all tour operators I found.

Does anybody have experiences or internet links for such a tour?

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