Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dong hieu co snippets" » "dung hieu co snippets", "dong trieu co snippets", "doc hieu co snippets", "dong hieu so snippets", "dong hieu bo snippets", "dong hieu ca 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 hieu co 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 hieu co snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong hieu co snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong hieu co snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.