Perhaps you should try some spelling variations:
"yang zhang a snippets" » "yan zhang a snippets", "cang thang a snippets", "lang thang a snippets", "yang khang a snippets", "yang chang ha snippets", "yang thang ay snippets", "yang zhang a slippers"
"python using java snippets" » "python using data snippets", "python using java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("yang zhang a snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("yang zhang a snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( yang zhang a snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("yang zhang a snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.