Perhaps you should try some spelling variations:
chau tinh » cuu tinh, ha tinh, cac tinh
cua tinh » cua sinh, va tinh, ha tinh
hanh han » hanh nhan, hanh phan, hanh san
va thong » va thuong, va phuong, va cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » 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 han ((va thong) OR (he thong)) cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chau tinh) OR (cua tinh)) - hanh han ((va thong) OR (he thong)) cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chau tinh) or (cua tinh)) - hanh han ((va thong) OR (he thong)) cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chau tinh) or (cua tinh)) - hanh han ((va thong) OR (he thong)) cong dan toan cau*.