Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
phan xuong » phan cong
xuong cong » luong cong, duong cong, cuong cong
cong thanh » dong thanh, cong trinh, cong tan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh dung » thanh dung, anh dung, hanh dong
dung phan » dung nhan, dung luan, dung ha
thanh hai » thanh phan, thanh hoa, thanh san
toan lap » toan tap, toan lao, thanh lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet tach - hanh dung phan xuong cong thanh ((toan lap) or (thanh hai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh dung phan xuong cong thanh ((toan lap) OR (thanh hai)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh dung phan xuong cong thanh ((toan lap) or (thanh hai))*.