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
phuong dan » phuong danh, phuong doan, huong dan
hieu sang » chieu sang, hieu lang, nhieu tang
va truong » van truong, xa truong, va thuong
trang va » tran van, hang va
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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 cau) OR (toan ban))~.
• 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 cau) OR (toan ban)).
• 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 cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (hieu quang)) - hanh trang va truong phuong dan ((toan cau) OR (toan ban))*.