Perhaps you should try some spelling variations:
zhang ming » zhang xin
ren zhang » zhen zhang, bin zhang, ceo zhang
lang yan » wang yan, wang yang, zhang yan
yan guan » gan guan, yan yuan, yang guang
tuan hua » tuan vu, yuan hui
code shu » code ctu
tan hua » wang hua, tan chia, tan puay

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 yan ((((yan guan) OR (tuan hua))) OR (tan hua)) ren zhang ming code shu ;~.
• Adding a wildcard symbol may retrieve word variants: lang yan ((((yan guan) or (tuan hua))) or (tan hua)) ren zhang ming code shu ;*.