Perhaps you should try some spelling variations:
"khoang trong co snippets" » "hoang trong co snippets", "cong trong co snippets", "duong trong co snippets", "khoang trong ca snippets", "khoang trong cong snippets", "khoang trong cuoc snippets"
"using a code snippets" » "using a core snippets"
"locating bug code snippets" » "locating bug core 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: (((("using a code snippets") or ("khoang trong co snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using a code snippets") OR ("khoang trong co snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using a code snippets ) or ( khoang trong co snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using a code snippets") or ("khoang trong co snippets"))) or ("locating bug code snippets"))*.