Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
thong cong » trong cong, tong cong, thong thong
hanh tinh » hanh trinh, thanh tinh, canh tinh
cua thong » cua thuong, cua khong, cua tong
so thiet » soc thiet, hoc thiet, hoa thiet
cong tan » cong tac, cong san, cong thanh
tan ran » tan tran, tan van, tan san
ran cau » van cau, ban cau, can cau

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 tinh) or (nhanh tinh)) cua thong cong tan ran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so thiet tach - ((hanh tinh) OR (nhanh tinh)) cua thong cong tan ran cau*.