Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"lan dau den snippets" » "van dau den snippets", "ban dau den snippets", "han dau den snippets", "lan dau dien snippets", "lan dan den snippets", "lan cau den 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: (((("lan dau 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: (((("lan dau den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lan dau den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lan dau den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.