Perhaps you should try some spelling variations:
"nhoc nhan cua snippets" » "ngoc nhan cua snippets", "hoc nhan cua snippets", "nhac nhan cua snippets", "nhoc nhat cua snippets", "nhoc nhan luc snippets", "nhoc nhan su snippets"
"dung java java snippets" » "dung va java 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: (((("nhoc nhan cua snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nhoc nhan cua snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhoc nhan cua snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhoc nhan cua snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.