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