Perhaps you should try some spelling variations:
cong ngang » cong nhan, cong quang, cong nong
hanh trong » hanh trang, anh trong, hinh trong
doi chieu » doi chi, mot chieu, ho chieu
trong nam » thong nam, trong lam, trong cac
cong lang » cong vang, cong luong, cong quang
nhanh cau » nhanh cay, thanh chau, nhanh ha
doc hieu » toc thieu, hoc thieu, hoc hien
nam dang » nam dan, nam danh, nam dong

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 (doc hieu)) sach - hanh trong nam dang ((cong ngang) or (cong lang)) nhanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - hanh trong nam dang ((cong ngang) OR (cong lang)) nhanh cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doc hieu)) sach - hanh trong nam dang ((cong ngang) or (cong lang)) nhanh cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doc hieu)) sach - hanh trong nam dang ((cong ngang) or (cong lang)) nhanh cau*.