Perhaps you should try some spelling variations:
chiet tach » chieu sach
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trung cap » truong cao, trung tam
trung lap » truong lam, truong lop, trung tam
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - hanh ((trung cap) or (trung lap)) dung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh ((trung cap) OR (trung lap)) dung cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh ((trung cap) or (trung lap)) dung cong dan than cau*.