Perhaps you should try some spelling variations:
nhung dung » phuong dung, ung dung, thong dung
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
doanh cua » doanh luan
dung manh » duong manh, dung danh, hung manh
manh cua » ban cua
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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 - canh ((manh cua) OR (doanh cua)) nhung dung manh ((toan cau) OR (toan ban))~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh ((manh cua) or (doanh cua)) nhung dung manh ((toan cau) or (toan ban))*.