Perhaps you should try some spelling variations:
income scale » income share, income shares
human income » roman income, mean income, loan income
scale case » scalar case
case young » east young, jae young, wage young
yang yang » wang yang, wang yan
young get » young let, young ages, young men

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: wang ((yao yang) OR (yang yang)) human income scale case young get ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((yao yang) or (yang yang)) human income scale case young get ;*.