Perhaps you should try some spelling variations:
thiet tach » thien hach
thuat tach » thuat sach, thuat mach, thuat tac
chiet tach » chieu sach
doanh cua » doanh luan
cua trong » cua truong, cua trung, qua trong
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan cac » nhan cach, phan dau, phan lap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((thiet tach) OR (thuat tach))) OR (chiet tach)) - kinh doanh cua trong cong dan phan cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((thiet tach) OR (thuat tach))) or (chiet tach)) - kinh doanh cua trong cong dan phan cac~".
• Adding a wildcard symbol may retrieve word variants: hoc ((((thiet tach) OR (thuat tach))) or (chiet tach)) - kinh doanh cua trong cong dan phan cac*.