Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
hien sang » hien trang, khien bang, chieu sang
trung cua » truong cua, trung cap, dung cua
dan toan » van toan, dan than, manh toan
van tan » van tuan, van ban, van tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sang - hanh ((trung cua) or (trung tuan)) nhung cong ((dan toan) or (van tan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sang - hanh ((trung cua) OR (trung tuan)) nhung cong ((dan toan) OR (van tan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien sang - hanh ((trung cua) or (trung tuan)) nhung cong ((dan toan) or (van tan)) cau*.