Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nin van toan snippets" » "nin van tuan snippets", "nin van tan snippets", "nin van thanh snippets", "nhin van toan snippets", "nen van toan snippets", "nan van 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: (((("nin van 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: (((("nin van toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nin van toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nin van toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.