Perhaps you should try some spelling variations:
manh truong » manh trung, manh tuong, anh truong
chieu sang » chieu sach, chieu xanh, hieu lang
hieu manh » chieu xanh, hieu nganh, dieu hanh
truong ca » truong cao, truong va, trong ca
tong cong » trong cong, cong cong, dung cong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
ca tong » ca trong, cap tong, cua tong

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (chieu sang)) - manh truong ca tong cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu sang)) - manh truong ca tong cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chieu sang)) - manh truong ca tong cong dan than cau*.