Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"quoc van da snippets" » "quoc va da snippets", "quoc ban da snippets", "quoc lan da snippets", "quoc van dao snippets", "quoc van dau snippets", "quoc van dan 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: (((("quoc van da snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("quoc van da snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( quoc van da snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("quoc van da snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.