Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoi van te snippets" » "khoi can te snippets", "khoi va te snippets", "thoai van te snippets", "khoi van de snippets", "khoi van tu snippets", "khoi van le 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: (((("khoi van te snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoi van te snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoi van te snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoi van te snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.