Perhaps you should try some spelling variations:
thinking firm » thinking form, thinking from, thinking circa
can thinking » lean thinking, case thinking, a thinking
yan liang » yang liang, wang liang, yan wang
you liang » you xian, you liangzhi
kann eine » kann ein, dann einen, kann die
song skin » song shin, song jin, song min

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: wai ((yan liang) OR (you liang)) li can thinking firm ((kann eine) OR (song skin)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wai ((yan liang) OR (you liang)) li can thinking firm ((kann eine) or (song skin)) ;~".
• Adding a wildcard symbol may retrieve word variants: wai ((yan liang) OR (you liang)) li can thinking firm ((kann eine) or (song skin)) ;*.