Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
cang thang » cong thanh, dang thanh
hoc thiet » hoc thieu, hoc thuyet, hoc hien
chua dong » cua dong, huy dong, hoa dong
thang van » tang van, thanh van, thong van
ha dong » hoat dong, van dong
van cau » van dau, van hau, van chat

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