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, hanh mang, hanh tung
cua nhung » va nhung
anh tang » anh bang, anh dang, anh nang
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) OR (anh 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) OR (anh tang)) cua nhung cong ((van toan) OR (van tuan)) ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien ngan - ((hanh tang) OR (anh tang)) cua nhung cong ((van toan) or (van tuan)) ban*".