Perhaps you should try some spelling variations:
"van hanh code snippets" » "van hanh de snippets", "van hanh cong snippets", "van hanh cad snippets", "van thanh code snippets", "ban hanh code snippets", "van anh code snippets", "van hanh code slippers"
"dung du code snippets" » "dung de code snippets", "dung cu code snippets", "dung cua code snippets", "dung du 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 du code snippets") or ("van hanh code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung du code snippets") OR ("van hanh code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung du code snippets ) or ( van hanh code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung du code snippets") or ("van hanh code snippets"))) or ("locating bug code snippets"))*.