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.

• If you are trying to use Boolean operators, they must be ALL CAPS: 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 ;*.