Perhaps you should try some spelling variations:
thanh dung » thanh duong, thanh tung, thanh hung
chieu sang » chieu sach, chieu xanh, hieu lang
phan cong » thanh cong
cong thai » cong hai, hong thai, cong thanh
hieu van » hieu va, thien van, lieu va
dung hoa » dung khoa, duong hoa, dung hoai
hoa phan » hoa dan, co phan
thai dan » thai doan, thai danh, thoai dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu sang) or (hieu van)) - thanh dung hoa phan cong thai dan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (hieu van)) - thanh dung hoa phan cong thai dan ca.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) or (hieu van)) - thanh dung hoa phan cong thai dan ca*.