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