Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngo duc toan snippets" » "ngo duc tan snippets", "ngo duc ton snippets", "ngo duc hoan snippets", "ngoc duc 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: (((("ngo duc 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: (((("ngo duc toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngo duc toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngo duc toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.