Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
trinh van » trinh han, trinh quan, trinh toan
tinh cua » trinh cua, sinh cua, tranh cua
sinh va » sinh vat, tinh va, dinh van
van cau » van dau, van hau, van chat

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 khang - hanh ((((tinh cua) OR (tinh chat))) OR (sinh va)) nhung cong trinh van cau~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu khang - hanh ((((tinh cua) or (tinh chat))) or (sinh va)) nhung cong trinh van cau*.