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