Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu qua, diep quang
thanh hang » thanh hoang, thanh thang, tranh hang
thong cong » trong cong, tong cong, thong thong
hieu quan » hieu qua, lieu quan, thien quan
thanh cac » hanh cac, thanh bac, thanh ca
va thong » va thuong, va phuong, he thong
cong ban » cong bang, cong san, cong tan
than cap » khan cap, thanh lap, than cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu quang) or (hieu quan)) - thanh hang va thong cong ban ((than cap) OR (thanh cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu quang) OR (hieu quan)) - thanh hang va thong cong ban ((than cap) OR (thanh cac))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu quang) or (hieu quan)) - thanh hang va thong cong ban ((than cap) OR (thanh cac))*".