Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
nhung cong » dung cong, thong cong, hang cong
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
so thiet » soc thiet, hoc thiet, hoa thiet
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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 - thanh ((trung cua) or (trung cap)) nhung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so thiet tach - thanh ((trung cua) OR (trung cap)) nhung cong dan toan cau*.