Perhaps you should try some spelling variations:
thien hach » thien thanh
nhung cong » dung cong, thong cong, hang cong
hien hanh » dieu hanh
tranh cua » doanh cua, manh cua
cua nhung » va nhung
van thanh » ban thanh
van tuan » van quan, van ban, anh tuan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (hien hanh)) - canh tranh cua nhung cong ((van thanh) OR (van tuan)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) or (hien hanh)) - canh tranh cua nhung cong ((van thanh) OR (van tuan)) tap~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) or (hien hanh)) - canh tranh cua nhung cong ((van thanh) OR (van tuan)) tap*.