Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
dung cong » dung trong
tien anh » tieng anh, tien manh, dien anh
mang cua » manh cua, dung cua, ban cua
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
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: hoc ((thieu xanh) or (tien anh)) - hanh ((thong quan) or (mang cua)) dung cong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (tien anh)) - hanh ((thong quan) OR (mang cua)) dung cong tap toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (tien anh)) - hanh ((thong quan) or (mang cua)) dung cong tap toan cau*.