Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
trang cua » tranh cua, tang cua, thang cua
trung cua » truong cua, trung tuan, trung cap
ho thiet » hoc thiet, hoa thiet, so thiet
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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: ho thiet tach - hanh ((trang cua) or (trung cua)) nhung ((cong dan) OR (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thiet tach - hanh ((trang cua) OR (trung cua)) nhung ((cong dan) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho thiet tach - hanh ((trang cua) or (trung cua)) nhung ((cong dan) OR (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ho thiet tach - hanh ((trang cua) or (trung cua)) nhung ((cong dan) OR (cong san)) toan cao*.