Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
chau tinh » cuu tinh, ha tinh, cac tinh
hanh hang » thanh hang, hang hang, hanh mang
va phuong » va thuong, cac phuong
cua tinh » cua sinh, va tinh, ha tinh
hanh han » hanh nhan, hanh phan, hanh san
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh 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 ((chau tinh) or (cua tinh)) - ((hanh hang) or (hanh han)) va phuong cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chau tinh) OR (cua tinh)) - ((hanh hang) OR (hanh han)) va phuong cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((chau tinh) or (cua tinh)) - ((hanh hang) or (hanh han)) va phuong cong dan toan cao*.