Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien ngan » hiem ngan, vien nganh, hien nhanh
hanh tang » hanh trang, anh tang, hanh mang
cua nhung » va nhung
tang cua » mang cua, hang cua, tang luan
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

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 tang cua nhung cong ((van toan) or (van tuan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien ngan - hanh tang cua nhung cong ((van toan) OR (van tuan)) ban*.