Sometimes Lanes & Planes doesn't show certain train connections, even though they exist. They are shown on the website of Deutsche Bahn, but you are also not able to book those trains on www.bahn.de since they have regional fares that can only be booked directly with the provider.
Lanes & Planes only shows connections that can be booked via our system. (Exeptions are transit connections, where parts of the ticket can be booked.)
Arrival: Cottbus Hbf
Result on www.bahn.de:
Result on Lanes & Planes: