Perhaps you should try some spelling variations:
quang nhung » quang hung, quan nhung, quang phuong
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
duong manh » duong van
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
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 sang) OR (chieu sach)) - hanh tinh quang nhung ((cong manh) or (duong manh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu sach)) - hanh tinh quang nhung ((cong manh) OR (duong manh)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (chieu sach)) - hanh tinh quang nhung ((cong manh) or (duong manh)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (chieu sach)) - hanh tinh quang nhung ((cong manh) or (duong manh)) toan cau*.