Perhaps you should try some spelling variations:
lang yanling » wang yanling, wang yangming, zhang yunling
form 7.2.1 » form 2.2.2
zlang iii » klang iii, zwang iii, zugang iii
form 2.1 » form 1.1, reform 2.1, form 3.2
david ng » david g, david n, david a
ng hai » dang hai, hong hai
yang » wang

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 yanling ((zlang iii) OR (yang di)) ((form 2.1) OR (form 7.2.1)) david ng hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "lang yanling ((zlang iii) or (yang di)) ((form 2.1) OR (form 7.2.1)) david ng hai ;~".
• Adding a wildcard symbol may retrieve word variants: lang yanling ((zlang iii) or (yang di)) ((form 2.1) OR (form 7.2.1)) david ng hai ;*.