Welcome, Jonas Andersson!
"Van der Waals forces" is quite vague.
Local dipoles, not necessarily observable over the whole molecule, for instance if they cancel out, can also act between neighbour molecules, if these have suitable positions and orientations. An example would be the linear O=C=O.
The conformation of a molecule in three dimensions matters too. For instance PVDF
becomes strongly ferroelectric after a polarization step that puts most F at one side and most H at the other.