Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den hang hoa snippets" » "den nang hoa snippets", "den bang hoa snippets", "den hanh hoa snippets", "den hang khoa snippets", "den thanh hoa snippets", "den hang va 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: (((("den hang hoa snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("den hang hoa snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den hang hoa snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den hang hoa snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.