Perhaps you should try some spelling variations:
khong thong » thong thong, khong trong, thong thuong
trung tuan » trung thanh, trung tam, truong thanh
hieu lang » chieu sang, hieu quang, nhieu tang
tran tuan » tran xuan, tran quang, tran thanh
doan phan » doanh phan, toan phan, doanh nhan
doi hieu » doi chieu, doc hieu, doi hien
dan phan » dan chan, van phan, dam phan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - thanh ((trung tuan) OR (tran tuan)) khong thong ((dan phan) OR (doan phan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - thanh ((trung tuan) or (tran tuan)) khong thong ((dan phan) OR (doan phan)) cau~".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - thanh ((trung tuan) or (tran tuan)) khong thong ((dan phan) OR (doan phan)) cau*.