Perhaps you should try some spelling variations:
"duong che hoat snippets" » "dong che hoat snippets", "dung che hoat snippets", "luong che hoat snippets", "duong che khoa snippets", "duong cao hoat snippets", "duong co hoat 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: (((("duong che hoat snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duong che hoat snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duong che hoat snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duong che hoat snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.