Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thong cua » thong quan, thong tu, huong cua
ho thiet » hoc thiet, hoa thiet, so thiet
dung cua » dung luan, dung cho
tong tan » trong tan, cong tan, tong tap
toan cao » toan ban
toan tap » toan 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 ((thong cua) or (dung cua)) han tong tan ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thiet tach - hanh ((thong cua) OR (dung cua)) han tong tan ((toan cao) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: ho thiet tach - hanh ((thong cua) or (dung cua)) han tong tan ((toan cao) or (toan tap))*.