Perhaps you should try some spelling variations:
black david » brock david, blanc david, baldock david
mark david » mare davide, parker david
lang lang » ylang ylang
young ghi » young choi, hong ghi, young get
lang tan » liang tan, tang tang, hong tan
yang li » yang lin, yang di, yang xi
li gene » i gene, l1 gene, iii gene

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: ((lang tan) OR (lang lang)) yang li gene ((black david) OR (mark david)) young ghi ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((lang tan) OR (lang lang)) yang li gene ((black david) or (mark david)) young ghi ;~".
• Adding a wildcard symbol may retrieve word variants: ((lang tan) OR (lang lang)) yang li gene ((black david) or (mark david)) young ghi ;*.