Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh dong » thanh duong, thanh cong, hanh dong
cac phuong » cac truong
hoc thieu » toc thieu, hoc hien
ha phuong » han phuong, hoa phuong, va phuong
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh dong ((ha phuong) OR (cac phuong)) cong ((van toan) OR (van tuan)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh dong ((ha phuong) or (cac phuong)) cong ((van toan) OR (van tuan)) tap~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh dong ((ha phuong) or (cac phuong)) cong ((van toan) OR (van tuan)) tap*.