Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc trieu » hoc thieu, hoc tieu, hoc dieu
tranh cua » doanh cua, manh cua
bang cong » dang cong, bang song, hang cong
ban cong » van cong, phan cong, ban huong
tam toan » tap toan, tam than, pham toan
pham tan » pham tuan, pham van, pham tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc trieu tinh - hanh tranh cua ((ban cong) or (bang cong)) ((tam toan) or (pham tan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc trieu tinh - hanh tranh cua ((ban cong) OR (bang cong)) ((tam toan) OR (pham tan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc trieu tinh - hanh tranh cua ((ban cong) or (bang cong)) ((tam toan) or (pham tan)) cao*.