Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
tran thanh » ban thanh, van thanh, quan thanh
trinh vat » trinh van, trinh luat, sinh vat
vat thong » va thong, vat trong, mat thong
tan thanh » tang thanh, toan thanh, ban thanh
ho chieu » hoc thieu, doi chieu, mot chieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (theo chieu)) sach - hanh trinh vat thong cong ((tan thanh) OR (tran thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) sach - hanh trinh vat thong cong ((tan thanh) OR (tran thanh)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo chieu)) sach - hanh trinh vat thong cong ((tan thanh) OR (tran thanh)) cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) sach - hanh trinh vat thong cong ((tan thanh) OR (tran thanh)) cau*.