Perhaps you should try some spelling variations:
human gene » human genome, human gender, human bone
zhang yan » zhang fan, zhang jian, wang yan
dong ping » dong sin, dong bin, dong jung
hua gene » hua ren, hy5 gene
song shu » cong shu, song shin, tong shui
li song » li cong, li rong, kim song
a gene » a genre, a gender, a gentle
tan li » tang li, tian li, gan li

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((zhang yan) or (dong ping)) ya ((((hua gene) OR (a gene))) or (human gene)) tan li song shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((zhang yan) OR (dong ping)) ya ((((hua gene) OR (a gene))) OR (human gene)) tan li song shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((zhang yan) or (dong ping)) ya ((((hua gene) OR (a gene))) or (human gene)) tan li song shu ;*".