Perhaps you should try some spelling variations:
savings waste » savings rate, savings rates, saving water
waste doing » waste going, waste being, waste dumping
wang zhang » wang zheng, wang luhang, zhang zhang
zhang ying » zhang ming, zhang jing, zhang ping
lower cost » lower costs, power costs, low cost
der cost » oder cost, user cost, debt cost

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "wang zhang ying ((der cost) OR (lower cost)) savings waste doing what ;~".
• Adding a wildcard symbol may retrieve word variants: wang zhang ying ((der cost) OR (lower cost)) savings waste doing what ;*.