Perhaps you should try some spelling variations:
estimates using » estimation using
states using » states during, rates using, studies using
des klangs » des planungs
klangs der » klang der, lange der, klage der
klang des » klang der, klarung des, klange das
der small » der smart, d small, der smad
dong ping » dong bin, dong jung, dong yang

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

• Performing a fuzzy search may retrieve terms with similar spellings: klang des klangs der small ((states using) OR (estimates using)) ((dong sin) or (dong ping)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: klang des klangs der small ((states using) OR (estimates using)) ((dong sin) OR (dong ping)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "klang des klangs der small ((states using) OR (estimates using)) ((dong sin) or (dong ping)) ;*".