Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet han so snippets" » "viet phan so snippets", "viet hang so snippets", "viet hoan so snippets", "viet than so snippets", "viet hon so snippets", "viet dan so 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 han so 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 han so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet han so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet han so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.