Perhaps you should try some spelling variations:
"Killer tips service" » "Killer his service", "Killer ais service", "Killer cifs service"
"killer tips series" » "killer tips secrets"
"Killer gps service" » "Killer des service", "Killer bus service", "Killer his service"
killer gps » killer apps, killer app, killer ape

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: (("killer tips series") OR ((("Killer tips service") OR ("Killer gps service")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"killer tips series\") or (((\"Killer tips service\") OR (\"Killer gps service\"))))".
• Removing quotes may allow a broader search: (( killer tips series ) or ((( Killer tips service ) OR ( Killer gps service )))).
• Adding a wildcard symbol may retrieve word variants: (("killer tips series") or ((("Killer tips service") OR ("Killer gps service"))))*.