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