Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, hang cong
trung cap » truong cao, trung tam
tran tuan » tran xuan, tran quang, tran thanh
ho chieu » theo chieu, hoc thieu, doi chieu
tan toan » tan tran, tap toan, van toan
bai toan » bai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu tinh - thanh ((trung cap) or (tran tuan)) nhung cong ((tan toan) or (bai toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu tinh - thanh ((trung cap) OR (tran tuan)) nhung cong ((tan toan) OR (bai toan)) tap.
• Adding a wildcard symbol may retrieve word variants: ho chieu tinh - thanh ((trung cap) or (tran tuan)) nhung cong ((tan toan) or (bai toan)) tap*.