Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
trinh han » trinh quan
tinh cua » trinh cua, sinh cua, tinh chat
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: theo chieu sach - hanh ((tinh cua) or (trinh han)) nhung cong ((van toan) or (dan chan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh ((tinh cua) OR (trinh han)) nhung cong ((van toan) OR (dan chan)) cau.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh ((tinh cua) or (trinh han)) nhung cong ((van toan) or (dan chan)) cau*.