Perhaps you should try some spelling variations:
skeletal structure » skeletal structures
structure analysis » structural analysis
liver skeletal » linear skeletal, layer skeletal, diverse skeletal
cost analysis » content analysis
line segment » line segments
segment cost » segment case, segment across, segmental post

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: (( liver skeletal structure analysis ) OR ( line segment cost analysis )).
• Adding a wildcard symbol may retrieve word variants: (( liver skeletal structure analysis ) or ( line segment cost analysis ))*.