Perhaps you should try some spelling variations:
thin zeng » thin end
thin lens » thin line, thin end
dong sign » dong sin, among sign, dong bin
dong skin » dong sin, dong bin, dof skin
yan yang » yang yang, yao yang, dan yang
yang jie » yang jin, yang di, yang jui
jie part » time part, fire part, life part
wang » wing, wan, lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yan yang jie part ((thin zeng) OR (thin lens)) ((dong sign) or (dong skin)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan yang jie part ((thin zeng) OR (thin lens)) ((dong sign) OR (dong skin)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan yang jie part ((thin zeng) OR (thin lens)) ((dong sign) or (dong skin)) ;*".