Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"zheng liu va snippets" » "zhifeng liu va snippets", "cheng lin va snippets", "cheng lu va snippets", "zheng lieu va snippets", "zheng lau va snippets", "zheng lu va 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: (((("zheng liu va snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("zheng liu va snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( zheng liu va snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("zheng liu va snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.