Perhaps you should try some spelling variations:
nhung luong » hung luong, nhung huong, nhung tuong
theo chieu » theo tieu, theo chu, thi chieu
luong bai » luong tai, cuong bai, luong bac
ho chieu » hoc thieu, doi chieu, mot chieu
tang cua » hang cua, tang luan, thong cua
mang cua » manh cua, dung cua, ban cua
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: ((theo chieu) OR (ho chieu)) sach - hanh ((tang cua) or (mang cua)) nhung luong bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (ho chieu)) sach - hanh ((tang cua) OR (mang cua)) nhung luong bai toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (ho chieu)) sach - hanh ((tang cua) or (mang cua)) nhung luong bai toan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (ho chieu)) sach - hanh ((tang cua) or (mang cua)) nhung luong bai toan cau*.