Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"va dan cho snippets" » "va danh cho snippets", "va san cho snippets", "va dac cho snippets", "ca dan cho snippets", "va dao cho snippets", "va dau cho 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 dan cho 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 dan cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( va dan cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("va dan cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.