Perhaps you should try some spelling variations:
"duong quang cu snippets" » "dung quang cu snippets", "luong quang cu snippets", "duong qua cu snippets", "duong quang cua snippets", "duong quang huy snippets", "duong quang cao 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 quang cu 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 quang cu snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duong quang cu snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duong quang cu snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.