Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cao hoc de snippets" » "co hoc de snippets", "cho hoc de snippets", "chat hoc de snippets", "cao hoc he snippets", "cao hoc te snippets", "cao hoc do 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: (((("cao hoc de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cao hoc de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cao hoc de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cao hoc de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.