Perhaps you should try some spelling variations:
case medicine » care medicine, based medicine, laser medicine
base medicine » based medicine, based medicines, biased medicine
primary case » primary cause, primary cases, primary care
primary base » primary phase, primary blast, primary cases

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: (( primary case medicine ) OR ( primary base medicine )).
• Adding a wildcard symbol may retrieve word variants: (( primary case medicine ) or ( primary base medicine ))*.