Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
theo hieu » theo chieu, theo tieu, thien hieu
trang cua » tranh cua, tang cua, trung cua
cua nhung » va nhung
dao van » do van, dang van

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu quang - hanh trang cua nhung cong ((luan van) or (dao van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu quang - hanh trang cua nhung cong ((luan van) OR (dao van)) ban.
• Adding a wildcard symbol may retrieve word variants: theo hieu quang - hanh trang cua nhung cong ((luan van) or (dao van)) ban*.