Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc tich he snippets" » "suc tich he snippets", "duy tich he snippets", "duc thinh he snippets", "duc tich ho snippets", "duc trinh he snippets", "duc tich hop 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: (((("duc tich 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: (((("duc tich he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc tich he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc tich he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.