Perhaps you should try some spelling variations:
clone chain » closed chain
long chain » long chemin, long grain, long han
qian wang » yiqian wang, qian rong, qian yan
wang xuan » wang xiuyan, wang xueman, wang yuhan
xuan gene » human gene
wai qian » wei qiang, ji qian, wai yan
mung sau » aung san, wong sau

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

• Performing a fuzzy search may retrieve terms with similar spellings: wai qian wang xuan gene ((clone chain) OR (long chain)) mung sau ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wai qian wang xuan gene ((clone chain) OR (long chain)) mung sau ;*".