Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dat tren » dat trong, dua tren
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
xuc van » luc van, xuc ban, thuc van
vuc van » luc van, thuc van, chuc van
duc van » duc va, duc tan, duc manh
y mang » cay mang
va cau » van cau, va cac, va dau
anh ve » hanh ve, anh va, anh viet
ve dat » de dat, va dat, ve dao

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

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