Perhaps you should try some spelling variations:
doi chieu » doc hieu, ho chieu, mot chieu
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
dung cong » dung trong
cong vang » cong lang, cong quang, cong ngang
tinh cua » trinh cua, sinh cua, tinh chat
cua dung » cua dang, cua dong, qua dung
phan dau » phan tu, hang dau
doi chi » doi khi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (doi chi)) sach - hanh tinh cua dung cong vang ((phan lap) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) sach - hanh tinh cua dung cong vang ((phan lap) OR (phan dau))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doi chi)) sach - hanh tinh cua dung cong vang ((phan lap) or (phan dau))*".