Perhaps you should try some spelling variations:
"planetary scientist" » "planetaria scientist", "planeta scientist", "planear scientist"
"planetary scientists" » "planetaria scientists", "planeta scientists", "planear scientists"
"planetario scientist" » "planetaria scientist"
"planetas scientists" » "planeta scientists", "plantas scientists", "planes scientists"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("planetary scientist") OR ("planetario scientist"))) OR ((("planetary scientists") OR ("planetas scientists"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"planetary scientist\") OR (\"planetario scientist\"))) OR (((\"planetary scientists\") OR (\"planetas scientists\"))))".
• Removing quotes may allow a broader search: (((( planetary scientist ) OR ( planetario scientist ))) OR ((( planetary scientists ) OR ( planetas scientists )))).
• Adding a wildcard symbol may retrieve word variants: (((("planetary scientist") OR ("planetario scientist"))) OR ((("planetary scientists") OR ("planetas scientists"))))*.