Perhaps you should try some spelling variations:
trinh quang » tinh quang, trinh quan, tranh quang
hanh trinh » canh tranh, hanh chinh
chieu xanh » chieu sach, chieu sang, chieu tinh
thong cong » tong cong, thong thong, phong chong
hieu lang » chieu sang, hieu quang, nhieu tang
san van » tan van, luan van, tran 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 ((chieu xanh) or (hieu lang)) - hanh trinh quang ((thong cong) OR (trong cong)) san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (hieu lang)) - hanh trinh quang ((thong cong) OR (trong cong)) san van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (hieu lang)) - hanh trinh quang ((thong cong) OR (trong cong)) san van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (hieu lang)) - hanh trinh quang ((thong cong) OR (trong cong)) san van ban*.