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