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