Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hanh trong » hanh trang, anh trong, hinh trong
trong dang » truong dang, trong dan, trong dong
so thiet » soc thiet, hoc thiet, hoa thiet
qua dung » quang dung, qua song, qua cong
toan cau » toan cao, toan ban, toan tai
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: so thiet tach - hanh trong ((qua dung) or (su dung)) trong dang ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so thiet tach - hanh trong ((qua dung) OR (su dung)) trong dang ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: so thiet tach - hanh trong ((qua dung) or (su dung)) trong dang ((toan cau) or (toan tap))*.