Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet theo so snippets" » "viet tien so snippets", "viet thuc so snippets", "viet tiep so snippets", "viet theo bo snippets", "viet theo doi snippets", "viet theo don 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 theo 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 theo so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet theo so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet theo so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.