Perhaps you should try some spelling variations:
doanh tranh » doanh thanh, canh tranh, doanh doanh
hoc thiet » hoc thieu, hoc thuyet, hoc hien
thiet anh » thien anh, thuyet anh, thien danh
tranh cua » doanh cua, manh cua
bang cong » dang cong, bang song, hang cong
cong bang » cuong bang, dong bang, hong bang
cua bang » chua bang, cua ban, cua dang
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet anh - doanh tranh cua bang cong bang ((than cau) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet anh - doanh tranh cua bang cong bang ((than cau) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet anh - doanh tranh cua bang cong bang ((than cau) or (than cap))*.