Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
trang cap » trung cap, trong cap, tranh chap
hoc dieu » hoc thieu, hoc hien
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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 dieu hanh - hanh trang cap ((nhung cong) OR (thong cong)) dan ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc dieu hanh - hanh trang cap ((nhung cong) or (thong cong)) dan ((toan cau) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc dieu hanh - hanh trang cap ((nhung cong) or (thong cong)) dan ((toan cau) OR (toan ban))*.