Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thieu xanh » chieu xanh, hieu manh, thien anh
tong cong » trong cong, cong cong, dung cong
tien anh » tieng anh, tien manh, dien anh
trinh va » trinh van, trinh vat, trinh ve
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan
va tong » va thong, va tuong, va trong

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 xanh) or (tien anh)) - hanh trinh va tong cong ((tan toan) or (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (tien anh)) - hanh trinh va tong cong ((tan toan) OR (tap toan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (tien anh)) - hanh trinh va tong cong ((tan toan) or (tap toan)) cau*.