Perhaps you should try some spelling variations:
yang guang » yang yang, yang liang
human bone » human bones, human body
using dna » using dea, using data, using drag
dna human » data human, a human
yan guan » gan guan, yan yuan, yihan guan
hong shu » tong shui, wong shiu, hong seo
line » life

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: line using dna human bone ((yan guan) OR (yang guang)) ((hong shu) OR (cong shu)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "line using dna human bone ((yan guan) or (yang guang)) ((hong shu) OR (cong shu)) ;~".
• Adding a wildcard symbol may retrieve word variants: line using dna human bone ((yan guan) or (yang guang)) ((hong shu) OR (cong shu)) ;*.