Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
tong xuong » tuong duong, khong xuong, thong duong
hoc thieu » toc thieu
trinh cua » tinh cua, trinh luat, trinh luan
xuong dan » huong dan, xuong san, tuong dan
dan toan » van toan, dan than, manh toan
toan tap » toan 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 thieu) OR (hoc hien)) xanh - hanh ((trinh cua) OR (trinh quan)) tong xuong dan toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (hoc hien)) xanh - hanh ((trinh cua) OR (trinh quan)) tong xuong dan toan tap~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (hoc hien)) xanh - hanh ((trinh cua) OR (trinh quan)) tong xuong dan toan tap*.