Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc tang que snippets" » "duc thang que snippets", "duc tan que snippets", "tuc tang que snippets", "duc lang que snippets", "duc tang quy snippets", "duc tang quan 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 tang que 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 tang que snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc tang que snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc tang que snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.