Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
trong dan » trong dang, trong san, trong tan
ho thiet » hoc thiet, hoa thiet, so thiet
qua dung » quang dung, su dung, qua song
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho thiet tach - ((hanh tranh) or (hanh trinh)) qua dung trong dan ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thiet tach - ((hanh tranh) OR (hanh trinh)) qua dung trong dan ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: ho thiet tach - ((hanh tranh) or (hanh trinh)) qua dung trong dan ((toan cau) or (toan ban))*.