Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
trung tuan » trung thanh, tran tuan, truong thanh
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
van khang » van khanh, van thanh, van quang
khang ban » hang ban, khang benh, khang chan
cong van » cong vang, cong san, song van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu lang) or (chieu xanh)) - manh ((trung tuan) OR (trung tam)) nhung cong van khang ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (chieu xanh)) - manh ((trung tuan) OR (trung tam)) nhung cong van khang ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu lang) or (chieu xanh)) - manh ((trung tuan) OR (trung tam)) nhung cong van khang ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (chieu xanh)) - manh ((trung tuan) OR (trung tam)) nhung cong van khang ban*.