Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dan vu hong snippets" » "dan vu cong snippets", "dan vu thuong snippets", "dan du phong snippets", "doan vu hong snippets", "dan su hong snippets", "dan va hong 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: (((("dan vu hong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dan vu hong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dan vu hong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan vu hong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.