Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet hang so snippets" » "viet hoang so snippets", "viet hung so snippets", "viet nang so snippets", "viet hang son snippets", "viet hoang son snippets", "viet hang hoa 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 hang 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 hang so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet hang so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet hang so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.