Perhaps you should try some spelling variations:
costo savings » cost savings, costs savings, cost saving
yang liang » wang liang, yan liang, yang yang
using dna » using dea, using data, using drag
using dem » using dea, using dhm, using deep
wan yang » wang yang, dan yang, tan yang
liang di » liang li, liang dan, liang wei
di costo » del costo, di cristo, da costa

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

• Performing a fuzzy search may retrieve terms with similar spellings: wan yang liang di costo savings ((using dna) or (using dem)) di ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wan yang liang di costo savings ((using dna) OR (using dem)) di ;.
• Adding a wildcard symbol may retrieve word variants: wan yang liang di costo savings ((using dna) or (using dem)) di ;*.