Perhaps you should try some spelling variations:
true costs » true cost, trade costs
things era » things here, things were, things a
dong sign » dong sin, among sign, dong bin
der last » deck last, died last, over last
yi gang » ii gang, i gang, li gang
dort ii » dort bin, dort hin
fan yi » tan yi, fan ying

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: fan yi gang ((true costs) OR (der last)) things era ((dort ii) OR (dong sign)) ;~.
• Adding a wildcard symbol may retrieve word variants: fan yi gang ((true costs) or (der last)) things era ((dort ii) or (dong sign)) ;*.