Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duoc dan con snippets" » "duc dan con snippets", "duoc ban con snippets", "duoc dai con snippets", "duoc day con snippets", "duoc dan mon snippets", "duoc dan bon 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: (((("duoc dan con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duoc dan con snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duoc dan con snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duoc dan con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.