Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, thi chieu
luat tong » luat trong, luat thong, luat cong
tong cong » trong cong, cong cong, dung cong
ho chieu » theo chieu, hoc thieu, thi chieu
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
toan cau » toan cao, toan ban, toan tap

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 (((doi chieu) OR (mot chieu)))) sach - hanh trinh luat tong cong bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (((doi chieu) OR (mot chieu)))) sach - hanh trinh luat tong cong bai toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (((doi chieu) OR (mot chieu)))) sach - hanh trinh luat tong cong bai toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (((doi chieu) OR (mot chieu)))) sach - hanh trinh luat tong cong bai toan cau*.