Perhaps you should try some spelling variations:
hanh thong » anh thong, hanh trong, hinh thong
chieu sang » chieu sach, chieu xanh, hieu lang
hang thong » hang thuong, hang khong, mang thong
dung cong » dung trong
qua dung » quang dung, su dung, qua song
cong san » cong tac
ha tinh » va tinh, may tinh
san van » tan van, luan van, tran van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (ha tinh)) - ((hanh thong) or (hang thong)) qua dung cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (ha tinh)) - ((hanh thong) OR (hang thong)) qua dung cong san van ban.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (ha tinh)) - ((hanh thong) or (hang thong)) qua dung cong san van ban*.