Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"quoc van cao snippets" » "quoc va cao snippets", "quoc ban cao snippets", "quoc lan cao snippets", "quoc van dao snippets", "quoc van bao snippets", "quoc van cau 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 cao 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 cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( quoc van cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("quoc van cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.