Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van tan soi snippets" » "van tuan soi snippets", "van ban soi snippets", "van tai soi snippets", "van tan hoi snippets", "van tan son snippets", "van tan voi 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 tan soi 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 tan soi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van tan soi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van tan soi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.