Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chiet tach » chieu sach
hieu lang » chieu sang, hieu quang, nhieu tang
cua khong » hua khong, cua phuong, cua thuong
cua dong » chua dong, cua cong, cua dang
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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: ho ((hieu lang) or (chiet tach)) - hanh trinh ((cua dong) or (cua khong)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chiet tach)) - hanh trinh ((cua dong) OR (cua khong)) cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chiet tach)) - hanh trinh ((cua dong) or (cua khong)) cong tac toan cau*.