Perhaps you should try some spelling variations:
yang fang » yang yang, yang guang, yang liang
yang fan » zhang fan, yang dean, yang yang
ein kern » einem kern, im kern, ii kern
iii kein » iii keine, iii ein, ii kein
gene we » gene w, gene one, gene set
a gene » a genre, a gender, a gentle
nai » naim, nair, nazi

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: wang ((yang fang) OR (yang fan)) a gene we ((ein kern) OR (iii kein)) nai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yang fang) OR (yang fan)) a gene we ((ein kern) or (iii kein)) nai ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((yang fang) OR (yang fan)) a gene we ((ein kern) or (iii kein)) nai ;*.