Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
van thuong » va thuong, van chuong, van phuong
thuong con » thuong dong, truong cong, thong cong
hieu sang » chieu sang, hieu quang, nhieu tang
hieu lang » chieu sang, hieu quang, nhieu tang
tranh ban » tranh hang, tranh luan, doanh ban
trinh ban » trinh han, trinh san, trinh dan
tran van » luan van
con sach » cuon sach, cong sach, co sach

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 sang) or (hieu lang)) - thanh tran van thuong con sach ((tranh ban) OR (trinh ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (hieu lang)) - thanh tran van thuong con sach ((tranh ban) OR (trinh ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sang) or (hieu lang)) - thanh tran van thuong con sach ((tranh ban) OR (trinh ban))".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (hieu lang)) - thanh tran van thuong con sach ((tranh ban) OR (trinh ban))*.