Perhaps you should try some spelling variations:
thuong tinh » thuong binh, truong tinh, thuong tin
khuong tinh » chuong trinh, phuong trinh, phuong binh
hanh trung » thanh trung, hanh trang, manh trung
chau tinh » cuu tinh, ha tinh, cac tinh
cua tinh » cua sinh, va tinh, ha tinh
toan cao » toan ban, toan tap
tam han » tam than, tam chan, tam hon

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 trung tam han ((thuong tinh) OR (khuong tinh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chau tinh) OR (cua tinh)) - hanh trung tam han ((thuong tinh) OR (khuong tinh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chau tinh) or (cua tinh)) - hanh trung tam han ((thuong tinh) OR (khuong tinh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chau tinh) or (cua tinh)) - hanh trung tam han ((thuong tinh) OR (khuong tinh)) toan cao*.