Perhaps you should try some spelling variations:
"trinh van cong snippets" » "trinh han cong snippets", "trinh quan cong snippets", "trinh toan cong snippets", "trinh van dong snippets", "trinh van phong snippets", "trinh phan cong 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 ("trinh van cong snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using a code snippets") OR ("trinh van cong snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using a code snippets ) or ( trinh van cong snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using a code snippets") or ("trinh van cong snippets"))) or ("locating bug code snippets"))*.