Perhaps you should try some spelling variations:
chiet tach » chieu sach
truong cao » truong dai
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
hoc chiet » hoc thiet, hoc nhiet, hoc hien
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap

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 ((truong cao) or (trung tuan)) nhung cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh ((truong cao) OR (trung tuan)) nhung cong tan toan cau*.