Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
trinh cua » tinh cua, trinh luat, trinh quan
hang cong » dang cong, hang nong, bang cong
cong vang » cong lang, cong quang, cong ngang
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - hanh ((tinh chat) or (trinh cua)) hang cong vang ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((tinh chat) OR (trinh cua)) hang cong vang ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((tinh chat) or (trinh cua)) hang cong vang ((toan cau) or (toan cao))*.