Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cuong tap » luong tap, luong tai, cong tan
mang cua » manh cua, ban cua, cong cua
dung cua » dung luan, dung cho
cong tac » cong ty
quan cap » quan cau, quan lap, quang cao

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 - hanh ((mang cua) or (dung cua)) thuong ((cuong tap) or (cong tac)) quan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh ((mang cua) OR (dung cua)) thuong ((cuong tap) OR (cong tac)) quan cap.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh ((mang cua) or (dung cua)) thuong ((cuong tap) or (cong tac)) quan cap*.