Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
duong manh » duong van
hoc chieu » hoc thieu, ho chieu, hoc hien
cong manh » cong danh, cong thanh, hoang manh
toan cau » toan cao, toan ban, toan tap
va lang » va nang, hoa lang

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 - ((sinh trung) or (thanh trung)) va lang ((cong manh) OR (duong manh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - ((sinh trung) OR (thanh trung)) va lang ((cong manh) OR (duong manh)) toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sang - ((sinh trung) or (thanh trung)) va lang ((cong manh) OR (duong manh)) toan cau*".