Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
vuong manh » duong manh, luong manh, vuong anh
anh tang » anh bang, anh dang, anh nang
va huong » va thuong, va phuong, ban huong
va tuong » va thuong, va thong, xa truong
toan cau » toan cao, toan ban, toan tap

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: theo chieu sach - anh tang ((va huong) OR (va tuong)) vuong manh ((toan cau) OR (van ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - anh tang ((va huong) OR (va tuong)) vuong manh ((toan cau) or (van ban))~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - anh tang ((va huong) OR (va tuong)) vuong manh ((toan cau) or (van ban))*.