Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sach » chinh sach, chiet tach, chieu sang
ho chieu » theo chieu, hoc thieu, doi chieu
tinh cua » trinh cua, tinh chat, tranh cua
sinh cua » manh cua, dinh cuu, sinh va
van toan » van tuan, van tan, van thanh
dan chan » dan gian, dan ca, van chat

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 - hanh ((tinh cua) OR (sinh cua)) nhung cong ((van toan) or (dan chan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh ((tinh cua) OR (sinh cua)) nhung cong ((van toan) OR (dan chan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh ((tinh cua) OR (sinh cua)) nhung cong ((van toan) or (dan chan)) cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((tinh cua) OR (sinh cua)) nhung cong ((van toan) or (dan chan)) cau*.