Perhaps you should try some spelling variations:
hoan thanh » hoang thanh, ban thanh, van thanh
theo chieu » ho chieu, theo chu, thi chieu
cong duong » cuong duong, cong dong, con duong
tinh hoan » trinh hoan, tinh toan, tinh hoa
duong dan » duong dang, huong dan, duong van
dan phan » doan phan, dan chan, van phan

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) or (theo tieu)) sach - tinh hoan thanh cong duong dan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo tieu)) sach - tinh hoan thanh cong duong dan phan tu.
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo tieu)) sach - tinh hoan thanh cong duong dan phan tu*.