Perhaps you should try some spelling variations:
codon optimization » wolf optimization (Expand Search)
based optimization » whale optimization (Expand Search)
primary drone » primary role (Expand Search), primary one (Expand Search), primary driver (Expand Search)
binary pair » binary pairs (Expand Search)
drone based » done based (Expand Search), one based (Expand Search), urine based (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( binary pair codon optimization algorithm ) OR ( primary drone based optimization algorithm ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( binary pair codon optimization algorithm ) OR ( primary drone based optimization algorithm ))".
• Adding a wildcard symbol may retrieve word variants: (( binary pair codon optimization algorithm ) OR ( primary drone based optimization algorithm ))*.