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