Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van thuat so snippets" » "va thuat so snippets", "van thuan so snippets", "van tuan so snippets", "van thuat do snippets", "van thuat o snippets", "van thuat co 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: (((("van thuat 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: (((("van thuat so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van thuat so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van thuat so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.