Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trung » thanh trung, hanh trang, manh trung
trung tuan » trung thanh, trung tam, tran tuan
nhung dong » nhung cong, nhung dung, nhung bong
hieu lang » chieu sang, nhieu tang, hieu van
nhung don » nhung van, nhung bo
anh luan » anh tuan, anh quan, anh xuan
luan ban » luan van, luan san, luan han

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu lang) OR (hieu quang)) - hanh trung tuan ((nhung dong) or (nhung don)) anh luan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu lang) OR (hieu quang)) - hanh trung tuan ((nhung dong) OR (nhung don)) anh luan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu lang) OR (hieu quang)) - hanh trung tuan ((nhung dong) or (nhung don)) anh luan ban".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu lang) OR (hieu quang)) - hanh trung tuan ((nhung dong) or (nhung don)) anh luan ban*.