Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc luu chan snippets" » "duc huu chan snippets", "duc luu chat snippets", "duc luu thanh snippets", "duoc luu chan snippets", "duc suu chan snippets", "duc luat chan 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 luu chan 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 luu chan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc luu chan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc luu chan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.