Perhaps you should try some spelling variations:
thuong hang » thuong han, thuong hung, thuong lang
hanh trang » thanh trung, canh tranh, hanh trinh
thieu sang » chieu sang, thieu khang, thieu quang
hieu lang » chieu sang, hieu quang, nhieu tang
trang va » tran van
luan ban » luan van, luan san, luat ban
luan han » luan hoan, luan phan, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sang) or (hieu lang)) - hanh trang va thuong hang va ((luan ban) or (luan han))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (hieu lang)) - hanh trang va thuong hang va ((luan ban) OR (luan han)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (hieu lang)) - hanh trang va thuong hang va ((luan ban) or (luan han))*.