Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc vung doi snippets" » "duc vuong doi snippets", "duc hung doi snippets", "duc dung doi snippets", "duc vong doi snippets", "duc vung dong 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 vung doi 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 vung doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc vung doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc vung doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.