Perhaps you should try some spelling variations:
hien ngan » hiem ngan, vien nganh, hien nhanh
hanh manh » hanh mang, lanh manh, hoang manh
cua nhung » va nhung
manh cua » doanh cua, ban cua
cong van » cong vang, song van, cong tan
cong san » cong tac
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien ngan - hanh manh cua nhung ((cong van) OR (cong san)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien ngan - hanh manh cua nhung ((cong van) OR (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc hien ngan - hanh manh cua nhung ((cong van) OR (cong san)) toan cao*.