Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
trinh cua » trinh luat, trinh quan, trinh luan
tinh cua » sinh cua, tinh chat, tranh cua
cong tao » cong tac, cong tan, cong bao
chat cam » thuat cam, chat va, chat ban
chat cao » chat co, chat cho, chat bao

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: hoc thieu sang - hanh ((trinh cua) OR (tinh cua)) nhung cong tao ((chat cam) OR (chat cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh ((trinh cua) or (tinh cua)) nhung cong tao ((chat cam) OR (chat cao))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((trinh cua) or (tinh cua)) nhung cong tao ((chat cam) OR (chat cao))*.