Perhaps you should try some spelling variations:
thin lens » thin end
thin line » think like
dong ping » dong bin, dong jung, dong yang
yan lang » yan liang, yan wang, yang yang
lang 3 » klang 3, gang 3, lang _
3 last » _ last, a last
wang » wing, wan
sin » sign, sind, skin

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 lang 3 last ((thin lens) OR (thin line)) ((dong ping) or (dong sin)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan lang 3 last ((thin lens) OR (thin line)) ((dong ping) OR (dong sin)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan lang 3 last ((thin lens) OR (thin line)) ((dong ping) or (dong sin)) ;".
• Adding a wildcard symbol may retrieve word variants: wang yan lang 3 last ((thin lens) OR (thin line)) ((dong ping) or (dong sin)) ;*.