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