Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chieu xanh » chieu sach, chieu sang, chieu tinh
thien anh » thien danh, tien anh, thien thanh
trinh cuu » trinh cau, trinh cua, trinh chu
nong cong » cong cong, tong cong, dong cong
nang cong » nang song, dang cong, bang cong
danh toan » manh toan, anh toan, dan 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: hoc ((chieu xanh) or (thien anh)) - hanh trinh cuu ((nong cong) OR (nang cong)) danh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (thien anh)) - hanh trinh cuu ((nong cong) OR (nang cong)) danh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (thien anh)) - hanh trinh cuu ((nong cong) OR (nang cong)) danh toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (thien anh)) - hanh trinh cuu ((nong cong) OR (nang cong)) danh toan cau*.