Perhaps you should try some spelling variations:
savings waste » savings rate, savings rates, saving water
zhang zhang » zhen zhang, cheng zhang, zhang fang
waste doing » waste going, waste being, waste dumping
wang zhang » wang zheng, wang luhang, wang liang
ying oder » ein oder
oder cost » der cost, lower cost, power 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) OR (zhang zhang)) ying oder cost savings waste doing what ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang zhang) OR (zhang zhang)) ying oder cost savings waste doing what ;*.