Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoi tinh he snippets" » "hoi tinh he snippets", "khoi kinh he snippets", "khoa tinh he snippets", "khoi trinh he snippets", "khoi tinh ha snippets", "khoi tich he 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 tinh he 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 tinh he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoi tinh he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoi tinh he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.