Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung chong » nhung cong, nhung phuong, phong chong
nhung phong » nhung phuong, nung phong, nguong phong
chieu sang » chieu sach, chieu xanh, hieu lang
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung ha » trung hoc, trung tam, trung cap
bai toan » bai tap
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: ho ((hieu manh) or (chieu sang)) - thanh trung ha ((nhung chong) OR (nhung phong)) bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu manh) OR (chieu sang)) - thanh trung ha ((nhung chong) OR (nhung phong)) bai toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (chieu sang)) - thanh trung ha ((nhung chong) OR (nhung phong)) bai toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chieu sang)) - thanh trung ha ((nhung chong) OR (nhung phong)) bai toan cau*.