Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thuat mach » thuat sach, thuat tach, thuyet mach
tranh cua » doanh cua, manh cua
dong cong » duong cong, dung cong, dang cong
van thanh » ban thanh, van tuan
thanh cau » thanh chau, thanh mau, nhanh cau
cua dong » chua dong, cua cong, cua dang
cong van » cong vang, cong san, song van

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 mach)) - canh tranh cua dong cong van thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thuat mach)) - canh tranh cua dong cong van thanh cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) or (thuat mach)) - canh tranh cua dong cong van thanh cau*.