Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
chieu sang » chieu sach, chieu xanh, hieu lang
chiet tach » chieu sach
tranh van » tran van, trinh van, thanh van
van nhung » van nhuong, va nhung, van hung
manh toan » thanh toan, anh tuan, tinh toan
dan toan » van toan, dan than, xuan toan

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 van nhung phuong ((dan toan) OR (manh toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chiet tach)) - canh tranh van nhung phuong ((dan toan) OR (manh toan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (chiet tach)) - canh tranh van nhung phuong ((dan toan) OR (manh toan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chiet tach)) - canh tranh van nhung phuong ((dan toan) OR (manh toan)) ban*.