Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach
thuat tach » thuat sach, thuat mach, thuat tac
tranh cua » doanh cua, manh cua
dong song » dong son, song song, dong cong
cua dong » chua dong, cua cong, cua dang
song van » hoang van, trong van, duong van
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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)) - canh tranh cua dong song van ((toan cau) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thuat tach)) - canh tranh cua dong song van ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet tach) or (thuat tach)) - canh tranh cua dong song van ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) or (thuat tach)) - canh tranh cua dong song van ((toan cau) OR (toan ban))*.