Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
chieu sang » chieu sach, chieu xanh, hieu lang
duong cong » dung cong, luong cong, duong trong
hanh hang » thanh hang, hang hang, hanh han
doan phan » doanh phan, toan phan, doanh nhan
ca duong » cau duong, cac duong, ca muong
dan phan » dan chan, van phan, dam phan
hang ca » hang va, nang cao, hang tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien hach) OR (chieu sang)) - hanh hang ca duong cong ((dan phan) OR (doan phan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) OR (chieu sang)) - hanh hang ca duong cong ((dan phan) OR (doan phan)) cau*".