Perhaps you should try some spelling variations:
chiet tach » chieu sach
minh trang » tinh trang, minh hoang, minh tuan
trong bai » trong ban, thong bai, trong hai
ho chiet » ho chieu, ho thiet, hoc thiet
vat dung » van dung, viet dung, mat duong
bai toan » bai tap
toan cau » toan cao, toan ban, toan tap
va dung » van dung, va duong, va ung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - ((minh trang) or (canh tranh)) ((va dung) OR (vat dung)) trong bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - ((minh trang) OR (canh tranh)) ((va dung) OR (vat dung)) trong bai toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - ((minh trang) or (canh tranh)) ((va dung) OR (vat dung)) trong bai toan cau".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - ((minh trang) or (canh tranh)) ((va dung) OR (vat dung)) trong bai toan cau*.