Perhaps you should try some spelling variations:
thanh trien » thanh tien, thanh truyen, thanh vien
trien thuat » thien thuat, trien hoat, chien thuat
thiet tach » chiet tach, thien hach
thuat tach » thuat sach, thuat mach, thuat tac
thuat tang » thuat trang, thuat tong, thuat bang
tang cuong » nang luong
dang thanh » dong thanh, hoang thanh, quang thanh
dang hanh » ban hanh, dang van, dang hung

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 tach)) - thanh trien thuat tang cuong ((dang thanh) or (dang hanh)) san~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thuat tach)) - thanh trien thuat tang cuong ((dang thanh) OR (dang hanh)) san.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet tach) OR (thuat tach)) - thanh trien thuat tang cuong ((dang thanh) or (dang hanh)) san".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) OR (thuat tach)) - thanh trien thuat tang cuong ((dang thanh) or (dang hanh)) san*.