Perhaps you should try some spelling variations:
"candidate skip" » "candidate ska", "candidate asking", "candidate skills"
"candidate spp" » "candidate snps", "candida spp", "candidate set"
"candidate snp" » "candidate snps", "candidate set", "candidate dna"

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: (((("candidate spp") OR ((("candidate skip") OR ("candidate snp"))))) OR ("candida _")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"candidate spp\") or (((\"candidate skip\") OR (\"candidate snp\"))))) or (\"candida _\"))".
• Removing quotes may allow a broader search: (((( candidate spp ) or ((( candidate skip ) OR ( candidate snp ))))) or ( candida _ )).
• Adding a wildcard symbol may retrieve word variants: (((("candidate spp") or ((("candidate skip") OR ("candidate snp"))))) or ("candida _"))*.