Perhaps you should try some spelling variations:
nhung tuong » nhung phuong, hung vuong, nhung cong
nhung huong » nhung phuong, nhung cong, nhung dung
chieu sang » chieu sach, chieu xanh, hieu lang
chiet tach » chieu sach
tranh va » tranh van, trang va, trinh va
dan van » dang van, doan van, dao 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 sang) or (chiet tach)) - canh tranh va ((nhung huong) OR (nhung tuong)) dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chiet tach)) - canh tranh va ((nhung huong) OR (nhung tuong)) dan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (chiet tach)) - canh tranh va ((nhung huong) OR (nhung tuong)) dan van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chiet tach)) - canh tranh va ((nhung huong) OR (nhung tuong)) dan van ban*.