Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den luc cau snippets" » "dien luc cau snippets", "dong luc cau snippets", "den thuc cau snippets", "den lua cau snippets", "den luc cao snippets", "den luc canh 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 luc cau 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 luc cau snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den luc cau snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den luc cau snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.