Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, thien anh, thien danh
lang duong » lang dong, lang muong, lang tuong
duong manh » duong van
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh hang » thanh hang, hang hang, hanh han
hang cac » hang ca, hang cau, bang cac
cac lang » cac dang, cac bang, cach mang
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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)) - hanh hang cac lang duong manh ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - hanh hang cac lang duong manh ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (hieu manh)) - hanh hang cac lang duong manh ((toan cau) or (toan tap))*.