Split body function doesn't fully split my body

[1900745KYKTT]

I am trying to split a cube with a complex surface body, however it only partially cuts.

Any idea 

[TrippyLighting]

You are better off separate this into a series of different cuts and combines.

The other alternative that I tried but did not in my test is to make sure there are edges in all these surface bodies where they intersect.

[1900745KYKTT]

I tried to do it cut by cut, but it also does this sometimes. It hapened to
me several times on different projects.