Perhaps you should try some spelling variations:
rontgenologische untersuchungen » rontgenologische untersuchung, rontgenographische untersuchungen, angiologische untersuchungen
phanomenologische untersuchung » pharmakologische untersuchungen, proktologische untersuchung, neurologische untersuchung

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((rontgenologische untersuchungen) OR (phanomenologische untersuchung)).
• Adding a wildcard symbol may retrieve word variants: ((rontgenologische untersuchungen) or (phanomenologische untersuchung))*.