Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
plus how » us how, bus how, plus new
how bias » home bias, how big, how bad
dann hat » wann hat, dang hai, man hat
dann war » wann war, da war, dann kam
dong di » dong sin
ye a » yet a, e a, me a
y a » y la

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((yang yang) OR (dong di)) ((ye a) OR (y a)) plus how bias ((dann hat) OR (dann war)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((yang yang) OR (dong di)) ((ye a) OR (y a)) plus how bias ((dann hat) OR (dann war)) ;*.