Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, hieu manh
chieu tinh » trieu tinh, lieu tinh, chau tinh
trung tao » trung tam, trung tai, trung tuan
trong tao » trong tan, trong tho, trong tai
thong tan » thong than, thong tran, thong tin
tran cau » tran chau, toan cau, ran cau

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 (chieu tinh)) - hanh ((trung tao) OR (trong tao)) thong thong tan tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu tinh)) - hanh ((trung tao) OR (trong tao)) thong thong tan tran cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (chieu tinh)) - hanh ((trung tao) OR (trong tao)) thong thong tan tran cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chieu tinh)) - hanh ((trung tao) OR (trong tao)) thong thong tan tran cau*.