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