Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh chua » tranh cua, trinh chuan, tranh chap
cong thanh » dong thanh, cong trinh, cong tan
chua hang » cua hang, chua nang, chua xang
hang cong » dang cong, hang nong, bang cong
so thiet » soc thiet, hoc thiet, hoa thiet
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 - hanh tranh chua hang cong thanh ((toan cao) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so thiet tach - hanh tranh chua hang cong thanh ((toan cao) OR (van ban))*.