Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
tuong cua » truong cua, huong cua, luong cua
thong cua » thong quan, thong tu, huong cua
ban cong » bang cong, van cong, phan cong
dan toan » van toan, dan than, manh toan
tap toan » tap doan, tap quan, bai toan

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