Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
viet dung » viet hung, viet huong, viet trung
trong tac » trong cac, tuong tac, trong tan
vat dung » van dung, va dung, mat duong
tac vang » cac van, tac dung, tac dong
vang ban » van ban, hang ban, nang ban

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 chinh ((vat dung) or (viet dung)) trong tac vang ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh chinh ((vat dung) OR (viet dung)) trong tac vang ban*.