Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu quan, diep quang
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
chan cap » khan cap, than cap, cao cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi ((hieu quang) OR (hieu qua)) - thanh trung cua nhung ((cong dan) or (cong tac)) chan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu quang) OR (hieu qua)) - thanh trung cua nhung ((cong dan) OR (cong tac)) chan cap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi ((hieu quang) OR (hieu qua)) - thanh trung cua nhung ((cong dan) or (cong tac)) chan cap*".