Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tranh qua » tranh cua, thanh qua, trinh qua
tong cong » cong cong, dung cong, dang cong
bang phan » nang phan, bang nhan, bang thanh
phan cau » phan dau, phan cac, phan tu

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 qua ((((tong cong) or (trong cong))) or (thong thong)) bang phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - canh tranh qua ((((tong cong) OR (trong cong))) OR (thong thong)) bang phan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - canh tranh qua ((((tong cong) or (trong cong))) or (thong thong)) bang phan cau*.