Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc tao den snippets" » "duc tan den snippets", "duc tho den snippets", "duc dao den snippets", "duc tao nen snippets", "duc tac den 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 tao den 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 tao den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc tao den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc tao den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.