Perhaps you should try some spelling variations:
balanced treatment » advanced treatment, blended treatment, advanced treatments
retarded treatment » retardant treatment, related treatment, reported treatment
headed treatment » blended treatment, delayed treatment, related treatment

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: ((((headed treatment) OR (balanced treatment))) OR (retarded treatment)).
• Adding a wildcard symbol may retrieve word variants: ((((headed treatment) or (balanced treatment))) or (retarded treatment))*.