Perhaps you should try some spelling variations:
trang nhung » trong nhung, tang nhung, trang phung
manh trong » manh truong, anh trong, manh tuong
chieu sang » chieu sach, chieu xanh, nhieu tang
manh trung » manh tung, thanh trung, manh hung
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
cong tac » cong ty
tac luan » tac quan, tao luan, tang luan

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

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