Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"o viet hoa snippets" » "o viet hoan snippets", "o viet khoa snippets", "o viet ha snippets", "so viet hoa snippets", "hoc viet hoa 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: (((("o viet hoa snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("o viet hoa snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( o viet hoa snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("o viet hoa snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.