Perhaps you should try some spelling variations:
cuong khong » cong khong, luong khong, muong khuong
nguoi cuong » nguoi muong, nguoi cong, nguoi thuong
khong hanh » khong thanh, hong hanh, phong thanh
thong minh » thong tin, hoang minh
giai toan » giai doan, giai toa, gioi toan
me nguoi » ma nguoi, le nguoi, ke nguoi
sach ha » sach nha, sach han, sach xa
te sach » toc sach
tu sach » thu sach, su sach, tu cach
va ve » va de, va le, va vi
ha me » cha me, ba me, ha le
ca ve » ca va

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach ((ca ve) OR (va ve)) giai toan thong minh ) or ( te sach ha me nguoi cuong khong hanh ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach ((ca ve) OR (va ve)) giai toan thong minh ) OR ( te sach ha me nguoi cuong khong hanh )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach ((ca ve) OR (va ve)) giai toan thong minh ) or ( te sach ha me nguoi cuong khong hanh ))".
• Adding a wildcard symbol may retrieve word variants: (( tu sach ((ca ve) OR (va ve)) giai toan thong minh ) or ( te sach ha me nguoi cuong khong hanh ))*.