Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
trinh xuat » trinh luat, trinh xuan, trich xuat
hoc thieu » toc thieu, hoc hien
trinh han » trinh quan
dong cong » duong cong, dung cong, dang cong
tap toan » tap doan, bai toan
tap quan » tac quan, hai quan

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 ((trinh xuat) or (trinh han)) dong cong ((tap toan) or (tap quan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((trinh xuat) OR (trinh han)) dong cong ((tap toan) OR (tap quan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((trinh xuat) or (trinh han)) dong cong ((tap toan) or (tap quan)) cao*.