Perhaps you should try some spelling variations:
"trinh lua cua snippets" » "trinh luat cua snippets", "trinh luan cua snippets", "trinh cua cua snippets", "trinh qua cua snippets", "trinh xua cua snippets"
"luong va code snippets" » "dung va code snippets", "luong va 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: (((("luong va code snippets") or ("trinh lua cua snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luong va code snippets") OR ("trinh lua cua snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luong va code snippets ) or ( trinh lua cua snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luong va code snippets") or ("trinh lua cua snippets"))) or ("locating bug code snippets"))*.