Perhaps you should try some spelling variations:
khang cong » hang cong, thanh cong, dang cong
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, biet lang
hanh luan » khanh luan, hang luan, hanh luat
van khang » van khanh, van thanh, van quang
hieu van » hieu va, thien van, lieu va
cong tap » cuong tap, cong tac, cong tan
tap quan » tac quan, hai quan
quan tap » quan tai, quan lap, quan tam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu van) or (((chieu sang) OR (hieu lang)))) - hanh luan van khang cong tap quan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu van) OR (((chieu sang) OR (hieu lang)))) - hanh luan van khang cong tap quan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu van) or (((chieu sang) OR (hieu lang)))) - hanh luan van khang cong tap quan tap".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu van) or (((chieu sang) OR (hieu lang)))) - hanh luan van khang cong tap quan tap*.