Perhaps you should try some spelling variations:
"tien hoang van dinh hoc." » "tien hoa van dinh hoc.", "tran hoang van dinh hoc.", "tuan hoang van dinh hoc.", "tien hang va dinh hoc.", "tien hoang van minh hoc.", "tien hoang van dich hoc.", "tien hoang va dinh hoc.", "tien hoang van sinh hoc.", "tien hoang van hinh hoc.", "tien hoang van tinh hoc."
"dun nang lam dinh f.c." » "dung nang lam dinh f.c.", "den nang lam dinh f.c.", "luan nang lam dinh f.c.", "dun nong lam dinh f.c.", "dun bang lam dinh f.c.", "dun mang lam dinh f.c.", "dun nang nam dinh f.c.", "dun nang lam tinh f.c.", "dun nang lam linh f.c.", "dun nang lam dinh duc.", "dun nang lam dinh cac.", "dun nang lam dinh doc."
"ky nang lam minh duc." » "ky nong lam minh duc.", "ky bang lam minh duc.", "ky mang lam minh duc.", "ky nang lam tinh duc.", "ky nang lam linh duc.", "ky nang pham minh duc."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("tien hoang van dinh hoc.") or ((("dun nang lam dinh f.c.") or ("ky nang lam minh duc."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("tien hoang van dinh hoc.") OR ((("dun nang lam dinh f.c.") OR ("ky nang lam minh duc."))))*.
• Removing quotes may allow a broader search: (( tien hoang van dinh hoc. ) or ((( dun nang lam dinh f.c. ) or ( ky nang lam minh duc. ))))*.