Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
luat thong » luat thuong, suat thong, luat trong
xuat thong » xuat thuong, suat thong, luat thuong
doi chieu » doc hieu, doi chi, mot chieu
ho chieu » theo chieu, hoc thieu, mot chieu
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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

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