Perhaps you should try some spelling variations:
truong phuong » truong chung, truong trung, dung phuong
hieu quang » thieu quang, hieu quan, hieu qua
hanh trang » thanh trung, canh tranh, hanh trinh
hieu sang » chieu sang, hieu lang, nhieu tang
va truong » van truong, xa truong, va thuong
manh toan » thanh toan, anh tuan, tinh toan
trang va » tran van, hang va
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: doc ((hieu sang) or (hieu quang)) - hanh trang va truong phuong ((dan toan) OR (manh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (hieu quang)) - hanh trang va truong phuong ((dan toan) OR (manh toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sang) or (hieu quang)) - hanh trang va truong phuong ((dan toan) OR (manh toan)) cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (hieu quang)) - hanh trang va truong phuong ((dan toan) OR (manh toan)) cau*.