Perhaps you should try some spelling variations:
meta theorie » meta theory, der theorie, la theorie
let theme » le theme, meta theme, en theme
one small » some small
nan yan » nan ya, wang yan, qian yan
yan can » yan clan, man can, yan cong
a genre » _ genre, a gender, a gentle
a gene » a gender, a gentle, a geneve

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: nan yan can ((a gene) OR (a genre)) ((((let theme) OR (meta theorie))) OR (let them)) one small ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nan yan can ((a gene) OR (a genre)) ((((let theme) or (meta theorie))) or (let them)) one small ;~".
• Adding a wildcard symbol may retrieve word variants: nan yan can ((a gene) OR (a genre)) ((((let theme) or (meta theorie))) or (let them)) one small ;*.