Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
trung quan » truong quan, trong quan, trung tuan
quan nhung » qua nhung, cua nhung, luan chung
duong manh » duong van
cong manh » cong danh, cong thanh, hoang manh
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 (chieu sang)) - thanh trung quan nhung ((cong manh) or (duong manh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu sang)) - thanh trung quan nhung ((cong manh) OR (duong manh)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) OR (chieu sang)) - thanh trung quan nhung ((cong manh) or (duong manh)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) OR (chieu sang)) - thanh trung quan nhung ((cong manh) or (duong manh)) toan cau*.