Perhaps you should try some spelling variations:
tong xuong » tuong duong, khong xuong, thong duong
hoc thieu » toc thieu
hanh sinh » hanh tinh, hanh dinh, hinh sinh
xuong dan » huong dan, xuong san, tuong dan
sinh cua » manh cua, dinh cuu, sinh va
cua tong » cua cong, cua dong, cua nong
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) or (hoc hien)) xanh - hanh sinh cua tong xuong dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (hoc hien)) xanh - hanh sinh cua tong xuong dan toan tap.
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (hoc hien)) xanh - hanh sinh cua tong xuong dan toan tap*.