Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tich va toan snippets" » "tich van toan snippets", "tich bai toan snippets", "tich tap toan snippets", "tinh va toan snippets", "dich va 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: (((("tich va 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: (((("tich va toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tich va toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tich va toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.