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