Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien danh
lanh tranh » canh tranh, lan tranh, hanh trinh
thien anh » thien danh, tien anh, thien thanh
lanh manh » lan anh, van manh, anh anh
dung cong » dung trong
cong san » cong tac
san chan » san chang, dan chan, san chay
chan cau » phan cau, can cau, chinh cau
va dung » van dung, va duong, vat dung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu xanh) or (thien anh)) - ((lanh manh) or (lanh tranh)) va dung cong san chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien anh)) - ((lanh manh) OR (lanh tranh)) va dung cong san chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien anh)) - ((lanh manh) or (lanh tranh)) va dung cong san chan cau*.