Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
khong xuong » khong dung, hong vuong, thong duong
chieu xanh » chieu sach, chieu sang, chieu tinh
trinh cua » trinh luat, trinh quan, trinh luan
xuong dan » huong dan, xuong san, tuong dan
tinh cua » sinh cua, tinh chat, tranh cua
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (thien thanh)) - hanh ((tinh cua) OR (trinh cua)) khong xuong dan toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (thien thanh)) - hanh ((tinh cua) OR (trinh cua)) khong xuong dan toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (thien thanh)) - hanh ((tinh cua) OR (trinh cua)) khong xuong dan toan ban*.