Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngu ban can snippets" » "ngu van can snippets", "ngu dan can snippets", "ngu ba can snippets", "ngu ban dan snippets", "ngu ban hang snippets", "ngu ban hanh 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: (((("ngu ban can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngu ban can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngu ban can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngu ban can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.