Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sach » chinh sach, chiet tach, chieu sang
manh toan » thanh toan, anh tuan, tinh toan
ho chieu » theo chieu, hoc thieu, doi chieu
tranh va » tranh van, trang va, trinh va
tran van » luan van
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: ho chieu sach - canh ((tranh va) or (tran van)) nhung cong ((dan toan) OR (manh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - canh ((tranh va) OR (tran van)) nhung cong ((dan toan) OR (manh toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - canh ((tranh va) or (tran van)) nhung cong ((dan toan) OR (manh toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - canh ((tranh va) or (tran van)) nhung cong ((dan toan) OR (manh toan)) cau*.