Perhaps you should try some spelling variations:
ying yang » yin yang, ying chang, wang yang
yang yang » wang yang, wang yan
der test » der tests, der text, der texte
per test » der tests, per cent, asr test
art song » a song
jie song » jae song, jin song, kim song
cong sun » cong shu, cong van, wing sun

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

• Performing a fuzzy search may retrieve terms with similar spellings: lang ((ying yang) OR (yang yang)) ((der test) or (per test)) ((art song) or (jie song)) cong sun ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: lang ((ying yang) OR (yang yang)) ((der test) OR (per test)) ((art song) OR (jie song)) cong sun ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "lang ((ying yang) OR (yang yang)) ((der test) or (per test)) ((art song) or (jie song)) cong sun ;".
• Adding a wildcard symbol may retrieve word variants: lang ((ying yang) OR (yang yang)) ((der test) or (per test)) ((art song) or (jie song)) cong sun ;*.