Perhaps you should try some spelling variations:
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tranh cua » doanh cua, manh cua
so thiet » soc thiet, hoa thiet, tao thiet
ho chieu » theo chieu, hoc thieu, doi chieu
dong tam » dong tai, dong nam, don tam
tam toan » tap toan, tam than, pham toan
toan ban » van ban

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: ((((so thiet) OR (hoc thiet))) OR (ho chieu)) tach - canh tranh cua cong dong tam toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((so thiet) OR (hoc thiet))) or (ho chieu)) tach - canh tranh cua cong dong tam toan ban~".
• Adding a wildcard symbol may retrieve word variants: ((((so thiet) OR (hoc thiet))) or (ho chieu)) tach - canh tranh cua cong dong tam toan ban*.