Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cheng vu ke snippets" » "cheng lu ke snippets", "hung vu ke snippets", "chen yu ke snippets", "cheng vu le snippets", "cheng va ke snippets", "cheng ve ke snippets"
"locating bug code snippets" » "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: (((("cheng vu ke snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cheng vu ke snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cheng vu ke snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cheng vu ke snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.