Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, xuc ban
vuc van » duc van, luc van, thuc van
y mang » cay mang
va cau » van cau, va cac, va cao
vi dau » vi dai, bi dau, ve dau
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y mang xa hoi. hieu va cau ((xuc van) or (vuc van)) hanh ((vi dau) OR (va dau)) tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y mang xa hoi. hieu va cau ((xuc van) OR (vuc van)) hanh ((vi dau) OR (va dau)) tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y mang xa hoi. hieu va cau ((xuc van) or (vuc van)) hanh ((vi dau) OR (va dau)) tien".
• Adding a wildcard symbol may retrieve word variants: thuat sach y mang xa hoi. hieu va cau ((xuc van) or (vuc van)) hanh ((vi dau) OR (va dau)) tien*.