Perhaps you should try some spelling variations:
costo savings » cost savings, costs savings, cost saving
liang dan » liang tan, king dan, liang sun
using dna » using dea, using data, using drag
using dem » using dea, using dhm, using deep
liang di » liang li, liang wei, liang zhi
wan yan » wang yan, nan yan, wai yan

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

• Performing a fuzzy search may retrieve terms with similar spellings: wan yan ((liang di) OR (liang dan)) costo savings ((using dna) or (using dem)) di ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wan yan ((liang di) OR (liang dan)) costo savings ((using dna) OR (using dem)) di ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wan yan ((liang di) OR (liang dan)) costo savings ((using dna) or (using dem)) di ;".
• Adding a wildcard symbol may retrieve word variants: wan yan ((liang di) OR (liang dan)) costo savings ((using dna) or (using dem)) di ;*.