Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"danh cao so snippets" » "doanh cao so snippets", "danh cho so snippets", "danh ca so snippets", "danh cao son snippets", "danh co so snippets", "danh cao su 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: (((("danh cao 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: (((("danh cao so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( danh cao so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("danh cao so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.