Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den voi cong snippets" » "den noi cong snippets", "den moi cong snippets", "den tai cong snippets", "dien voi cong snippets", "den coi cong snippets", "den vai cong 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 voi cong 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 voi cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den voi cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den voi cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.