Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
chieu sang » chieu sach, chieu xanh, hieu lang
thien anh » thien danh, tien anh, thien thanh
tranh chu » tranh chua, trinh chu, thanh chu
bang cong » dang cong, bang song, hang cong
chu bang » thu bang, chuc nang, chu quang
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan cau » phan dau, phan cac, phan tu

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 sang) or (thien anh)) - hanh tranh chu bang cong tan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (thien anh)) - hanh tranh chu bang cong tan phan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (thien anh)) - hanh tranh chu bang cong tan phan cau*.