Perhaps you should try some spelling variations:
"hoc chat cong snippets" » "hoc chat chong snippets", "hoc chat long snippets", "hoc chat song snippets", "hoc phat cong snippets", "hoc cao cong snippets", "hoc phan cong snippets"
"dung ung code snippets" » "dung trung code snippets", "dung quang code snippets", "dung chung code snippets", "dung ung co snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code 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 chat cong snippets") or ("dung ung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoc chat cong snippets") OR ("dung ung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc chat cong snippets ) or ( dung ung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc chat cong snippets") or ("dung ung code snippets"))) or ("locating bug code snippets"))*.