Perhaps you should try some spelling variations:
"Lonely Planet language survival rate" » "Lonely Planet language social rate", "Lonely Planet language services rate"
"Lonely Planet language survival rates" » "Lonely Planet language social rates", "Lonely Planet language services rates"
planet language » planned languages, plain language, present language

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("Lonely Planet language survival rate") OR ("Lonely Planet language survival rates"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"Lonely Planet language survival rate\") OR (\"Lonely Planet language survival rates\"))".
• Removing quotes may allow a broader search: (( Lonely Planet language survival rate ) OR ( Lonely Planet language survival rates )).
• Adding a wildcard symbol may retrieve word variants: (("Lonely Planet language survival rate") OR ("Lonely Planet language survival rates"))*.