Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach
thuat tach » thuat sach, thuat mach, thuat tac
nhung cong » dung cong, thong cong, hang cong
trung dam » trung tam, trung dai, trung nam
trong dam » trong lam, trong nam, trong cac
san nhanh » san thanh, nhan nhanh, ban hanh
cong san » cong tac
nhanh ha » thanh hoa, thanh hai, khanh hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thiet tach) OR (thuat tach)) - thanh ((trung dam) or (trong dam)) nhung cong san nhanh ha~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thuat tach)) - thanh ((trung dam) OR (trong dam)) nhung cong san nhanh ha*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet tach) OR (thuat tach)) - thanh ((trung dam) or (trong dam)) nhung cong san nhanh ha*".