Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc ngoc doc snippets" » "vu ngoc doc snippets", "bui ngoc doc snippets", "duc ngoc duc snippets", "duc ngon doc snippets", "duc ngo doc 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 ngoc doc 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 ngoc doc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc ngoc doc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc ngoc doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.