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