Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thi lan doan snippets" » "thi lan dan snippets", "thi tan doan snippets", "thi van doan snippets", "thi hanh doan snippets", "thi nang doan snippets", "thi lien doan 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: (((("thi lan doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thi lan doan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thi lan doan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi lan doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.