Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den vi cao snippets" » "den vai cao snippets", "den voi cao snippets", "don vi cao snippets", "den va cao snippets", "den vu cao snippets", "den vien cao 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 vi cao 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 vi cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den vi cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den vi cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.