Perhaps you should try some spelling variations:
"variable start" » "variable stars", "variable state", "variable part", "variable starst", "variable stept"
"variable steps" » "variable step", "variable stress", "variable stars"
"variable star" » "variable stars", "variable step"

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: (("variable star") OR ((("variable steps") OR ("variable start")))).
• Removing quotes may allow a broader search: (( variable star ) or ((( variable steps ) or ( variable start )))).
• Adding a wildcard symbol may retrieve word variants: (("variable star") or ((("variable steps") or ("variable start"))))*.