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