Perhaps you should try some spelling variations:
khong xuong » khong dung, hong vuong, thong duong
chieu sang » chieu sach, chieu xanh, hieu lang
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cua khong » hua khong, cua phuong, cua thuong
xuong dan » huong dan, xuong san, tuong dan
tinh cua » trinh cua, sinh cua, tinh chat
dan toan » van toan, dan than, manh toan
toan ban » van ban

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (thi thanh)) - hanh tinh cua khong xuong dan toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (thi thanh)) - hanh tinh cua khong xuong dan toan ban*.