Perhaps you should try some spelling variations:
"hoc rieng cua snippets" » "hoc tieng cua snippets", "hoc hien cua snippets", "hoc vien cua snippets", "hoc trien cua snippets", "hoc tien cua snippets", "hoc bien cua 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: (((("hoc rieng 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: (((("hoc rieng cua snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc rieng cua snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc rieng cua snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.