Perhaps you should try some spelling variations:
human death » human deaths, human data, human demand
some hope » hope hope, some open
20 human » 2 human, 10 human, 2011 human
yang yao » yang yang, yang yi, yang fan
death ia » death a, death far, death fig
hope tan » hong tan, hope a
yang ka » yang fan
ia some » a some, 9a some, asia some
g 20 » _ 20

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((((yang yao) OR (wang yan))) or (yang ka))) or (yang di))g 20 human death ia some hope tan ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((((yang yao) OR (wang yan))) OR (yang ka))) OR (yang di))g 20 human death ia some hope tan ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((yang yao) OR (wang yan))) or (yang ka))) or (yang di))g 20 human death ia some hope tan ;*".