Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, dieu hanh
nhung don » nhung van, nhung bo
dung cong » dung trong
anh dang » anh dong, anh dung, anh bang
dang cua » dung cua, dong cua, mang cua
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: theo tieu xanh - anh dang cua ((nhung don) or (dung cong)) bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - anh dang cua ((nhung don) OR (dung cong)) bai toan cau.
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - anh dang cua ((nhung don) or (dung cong)) bai toan cau*.