Perhaps you should try some spelling variations:
thanh tinh » thanh binh, nhanh tinh, than kinh
nhung dung » phuong dung, ung dung, thong dung
nhung cong » dung cong, thong cong, hang cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
phan cau » phan dau, phan cac, phan tu
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: doc hieu xanh - thanh tinh quang ((nhung dung) or (nhung cong)) dan ((phan cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh tinh quang ((nhung dung) OR (nhung cong)) dan ((phan cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh tinh quang ((nhung dung) or (nhung cong)) dan ((phan cau) or (toan cau))*.