Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"han viet mo snippets" » "san viet mo snippets", "van viet mo snippets", "dan viet mo snippets", "han viet o snippets", "han viet co snippets", "han viet xo 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 mo 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 mo snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( han viet mo snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("han viet mo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.