Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"cheng lu cao snippets" » "cheng lu code snippets", "cheng lin cao snippets", "zheng liu cao snippets", "chen yu cao snippets", "cheng luc cao snippets", "cheng cu cao snippets", "cheng vu cao snippets"
"python using java snippets" » "python using data snippets"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("cheng lu cao snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cheng lu cao snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( cheng lu cao snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cheng lu cao snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.