Perhaps you should try some spelling variations:
chuong trinh » cong trinh
thong trinh » thong tinh, phuong trinh, cong trinh
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
cua thong » cua thuong, cua khong, cua tong
sinh cua » manh cua, dinh cuu, sinh va
han dau » hang dau, phan dau, van 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) or (hieu quang)) - nhan sinh cua thong ((thong trinh) OR (chuong trinh)) han dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - nhan sinh cua thong ((thong trinh) OR (chuong trinh)) han dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (hieu quang)) - nhan sinh cua thong ((thong trinh) OR (chuong trinh)) han dau".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (hieu quang)) - nhan sinh cua thong ((thong trinh) OR (chuong trinh)) han dau*.