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