Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet dan cac snippets" » "viet van cac snippets", "viet da cac snippets", "viet dao cac snippets", "viet dan cach snippets", "viet dang cac snippets", "viet dan 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 dan cac 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 dan cac snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet dan cac snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet dan cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.