Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
tuan khong » toan khong, tuan phong, thuan phong
khong cong » thong cong, khong cang, chong cong
manh hung » anh huong
hung tuan » hung tran, quang tuan, trung tuan
manh toan » thanh toan, anh tuan
so thiet » soc thiet, hoc thiet, hoa thiet

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

• Performing a fuzzy search may retrieve terms with similar spellings: so thiet tach - manh hung tuan khong cong ((manh toan) or (tinh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so thiet tach - manh hung tuan khong cong ((manh toan) OR (tinh toan)) cao*.