Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet van dep snippets" » "viet nam dep snippets", "viet anh dep snippets", "viet ha dep snippets", "viet van de snippets", "viet van der snippets", "viet van den 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 dep 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 dep snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet van dep snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet van dep snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.