Perhaps you should try some spelling variations:
"khanh van cau snippets" » "thanh van cau snippets", "khanh vinh cau snippets", "hanh va cau snippets", "khanh van dau snippets", "khanh van hau snippets", "khanh van chat 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: (((("khanh van cau snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khanh van cau snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khanh van cau snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khanh van cau snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.