Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"han viet cho snippets" » "san viet cho snippets", "van viet cho snippets", "dan viet cho snippets", "han viec cho snippets", "han viet co snippets", "han viet theo 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: (((("han viet cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("han viet cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( han viet cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("han viet cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.