Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc moi he snippets" » "duoc moi he snippets", "duc loi he snippets", "duc mo he snippets", "duc moi ve snippets", "duc moi ke snippets", "duc moi de 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 moi he 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 moi he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc moi he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc moi he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.