Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sang » chieu sach, chieu xanh, hieu lang
trinh cua » trinh luat, trinh quan, trinh luan
ho chieu » theo chieu, hoc thieu, doi chieu
tinh cua » sinh cua, tinh chat, tranh cua
dan than » dan chan, ban than, van than

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - hanh ((tinh cua) OR (trinh cua)) nhung cong ((dan than) OR (dan ca)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - hanh ((tinh cua) OR (trinh cua)) nhung cong ((dan than) or (dan ca)) cau~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - hanh ((tinh cua) OR (trinh cua)) nhung cong ((dan than) or (dan ca)) cau*.