Perhaps you should try some spelling variations:
checking human » changing human, healing human, helping human
yan checking » am checking, fact checking, type checking
human income » roman income, mean income, loan income
income scale » income share, income shares
jae young » a young, ju young, saw young
wang » wing, wan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (wang or lang) yan checking human income scale ((wage young) OR (jae young)) ages ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (wang OR lang) yan checking human income scale ((wage young) OR (jae young)) ages ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(wang or lang) yan checking human income scale ((wage young) OR (jae young)) ages ;*".