Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
chieu sang » chieu sach, chieu xanh, nhieu tang
duong cong » dung cong, luong cong, duong trong
hieu lang » hieu quang, nhieu tang, hieu van
hanh hang » thanh hang, hang hang, hanh han
ca duong » cau duong, cac duong, ca muong
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu
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) OR (hieu lang)))) - hanh hang ca duong cong dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (((chieu sang) OR (hieu lang)))) - hanh hang ca duong cong dan phan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) or (((chieu sang) OR (hieu lang)))) - hanh hang ca duong cong dan phan cau*".