Perhaps you should try some spelling variations:
"van luong cac snippets" » "van duong cac snippets", "van cuong cac snippets", "nang luong cac snippets", "van luong cuoc snippets", "van luong va snippets", "van luong tai snippets"
"using ha van snippets" » "using a van snippets", "using half van snippets", "using raw van snippets", "using hoa van snippets", "using nha van snippets", "using va van snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("using ha van snippets") or ("van luong cac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using ha van snippets") OR ("van luong cac snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using ha van snippets ) or ( van luong cac snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using ha van snippets") or ("van luong cac snippets"))) or ("locating bug code snippets"))*.