Perhaps you should try some spelling variations:
vien thanh » tien thanh, dien thanh, thien thanh
viet thanh » viet anh
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, nhung don
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
tan toan » tan tran, tap toan, van toan
toan cau » 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 ((vien thanh) or (viet thanh)) - hanh tranh cua ((nhung cong) OR (hang cong)) tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((vien thanh) OR (viet thanh)) - hanh tranh cua ((nhung cong) OR (hang cong)) tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((vien thanh) or (viet thanh)) - hanh tranh cua ((nhung cong) OR (hang cong)) tan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((vien thanh) or (viet thanh)) - hanh tranh cua ((nhung cong) OR (hang cong)) tan toan cau*.