Perhaps you should try some spelling variations:
"hoc vien quan snippets" » "hoc lien quan snippets", "hoc van quan snippets", "hoc tin quan snippets", "hoc hien quan snippets", "hoc viet quan snippets", "hoc tieng quan snippets", "hoc vien quan slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "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 vien quan 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 vien quan snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc vien quan snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc vien quan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.