Perhaps you should try some spelling variations:
demands during » remarks during
water demands » water demand
zhang yan » zhang fan, zhang jian, wang yan
li zhang » _ zhang
yan run » can run, yan kun, bank run
bonn a » bonn am, bonn _, bon a
von a » von i, von f, von r

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: li zhang yan run water demands during ((((von a) OR (von h))) OR (bonn a)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "li zhang yan run water demands during ((((von a) OR (von h))) or (bonn a)) ;~".
• Adding a wildcard symbol may retrieve word variants: li zhang yan run water demands during ((((von a) OR (von h))) or (bonn a)) ;*.