Perhaps you should try some spelling variations:
thieu manh » hieu manh, tien manh, trieu minh
hanh trinh » canh tranh, hanh chinh
den thanh » de thanh, dinh thanh, dong thanh
trinh cua » tinh cua, trinh luat, trinh quan
bang cong » dang cong, bang song, hang cong
cua bang » chua bang, cua ban, cua dang
dan toan » van toan, dan than, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu manh) or (den thanh)) - hanh trinh cua bang cong ((dan toan) or (tinh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu manh) OR (den thanh)) - hanh trinh cua bang cong ((dan toan) OR (tinh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu manh) or (den thanh)) - hanh trinh cua bang cong ((dan toan) or (tinh toan)) cau*.