Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
chieu sang » chieu sach, chieu xanh, hieu lang
hoc chieu » hoc thieu, ho chieu, hoc hien
mang cua » manh cua, ban cua, cong cua
dung cua » dung luan, dung cho
cong tac » cong ty
tuan ban » tuan bang, toan ban, luan ban
quang » 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 chieu sang - hanh ((mang cua) or (dung cua)) thong cong tac ((tuan ban) or (tran quang))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - hanh ((mang cua) OR (dung cua)) thong cong tac ((tuan ban) OR (tran quang)).
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - hanh ((mang cua) or (dung cua)) thong cong tac ((tuan ban) or (tran quang))*.