Perhaps you should try some spelling variations:
chuong trinh » cong trinh
thong trinh » thong tinh, phuong trinh, cong trinh
hieu lang » chieu sang, hieu quang, nhieu tang
hanh sinh » hanh tinh, hanh dinh, hinh sinh
cua tong » cua cong, cua nong, cua song
cua dong » chua dong, cua cong, cua dang
ho hieu » ho chieu, hoi hieu, nho hieu
san dau » van dau, san diu, ban dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - hanh sinh ((cua tong) OR (cua dong)) ((thong trinh) or (chuong trinh)) san dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh sinh ((cua tong) OR (cua dong)) ((thong trinh) OR (chuong trinh)) san dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh sinh ((cua tong) OR (cua dong)) ((thong trinh) or (chuong trinh)) san dau".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh sinh ((cua tong) OR (cua dong)) ((thong trinh) or (chuong trinh)) san dau*.