Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
doi chieu » doc hieu, doi chi, ho chieu
thang cua » thong cua, hang cua, tang cua
cong cong » cong dong, trong cong, dung cong
trinh can » trinh han, trinh san, trinh cau
than cua » nhan cua, thai cua, ban cua
can cau » van cau, ban cau, ca cau

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 (doi chieu)) sach - nhanh ((thang cua) OR (than cua)) cong cong trinh can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doi chieu)) sach - nhanh ((thang cua) OR (than cua)) cong cong trinh can cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (doi chieu)) sach - nhanh ((thang cua) OR (than cua)) cong cong trinh can cau".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doi chieu)) sach - nhanh ((thang cua) OR (than cua)) cong cong trinh can cau*.