Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, thien anh, thien danh
thanh tung » thanh cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
dung cong » dung trong
tung tan » tung dan, cung tan, hung tan
tan dung » tran dung, tin dung, van dung
cong tai » cong thai, cong tac, dong tai
tren tau » tren thuc, tren may, tren thi
tren dat » tren dia, tren may

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 (hieu manh)) - thanh tung tan dung cong tai ((tren tau) OR (tren dat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - thanh tung tan dung cong tai ((tren tau) OR (tren dat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (hieu manh)) - thanh tung tan dung cong tai ((tren tau) OR (tren dat))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (hieu manh)) - thanh tung tan dung cong tai ((tren tau) OR (tren dat))*.