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