Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc luat cao snippets" » "duoc luat cao snippets", "duc duat cao snippets", "dung luat cao snippets", "duc luat bao snippets", "duc luat lao snippets", "duc luat cac 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: (((("duc luat 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: (((("duc luat cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc luat cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc luat cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.