Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
tong cong » cong cong, dung cong, dang cong
tung cua » trung cua, tuong cua, dung cua
ban toan » bai toan, ban than, van toan
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 - thanh tung cua ((trong cong) or (tong cong)) ban toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh tung cua ((trong cong) OR (tong cong)) ban toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh tung cua ((trong cong) or (tong cong)) ban toan cao*.