Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"don hoc de snippets" » "dong hoc de snippets", "mon hoc de snippets", "dan hoc de snippets", "don hoc he snippets", "don hoc te snippets", "don 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: (((("don 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: (((("don hoc de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( don hoc de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("don hoc de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.