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