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