Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"va don toi snippets" » "va dan toi snippets", "va doi toi snippets", "va don tai snippets", "va dong toi snippets", "va doc toi snippets", "va do toi 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: (((("va don toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("va don toi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( va don toi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("va don toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.