Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
hanh tang » hanh trang, hanh mang, hanh tung
va phuong » cac phuong
chu xanh » chu manh, chieu xanh, chua xang
anh tang » anh bang, anh dang, anh nang
toan tap » toan ban
cua chu » sua chua

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: cua chu xanh - ((hanh tang) OR (anh tang)) ((va phuong) OR (va thuong)) cong trinh toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cua chu xanh - ((hanh tang) OR (anh tang)) ((va phuong) or (va thuong)) cong trinh toan tap~".
• Adding a wildcard symbol may retrieve word variants: cua chu xanh - ((hanh tang) OR (anh tang)) ((va phuong) or (va thuong)) cong trinh toan tap*.