Perhaps you should try some spelling variations:
"luong cac che snippets" » "luong cuoc che snippets", "luong va che snippets", "luong tai che snippets", "luong cac he snippets", "luong cac chien snippets", "luong cac chat snippets"
"tang van code snippets" » "dang van code snippets", "hoang van code snippets", "trong van code snippets", "tang van de snippets", "tang van hoe snippets", "tang van cong snippets"
"locating bug code 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: (((("tang van code snippets") or ("luong cac che snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tang van code snippets") OR ("luong cac che snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tang van code snippets ) or ( luong cac che snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tang van code snippets") or ("luong cac che snippets"))) or ("locating bug code snippets"))*.