Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
xuc van » duc van, vuc van, xuc ban
luc van » luoc van, luu van, duc van
va cau » van cau, va cac, va dau
y mang » cay mang
vi dat » voi dat, va dat, ve dat
vi dai » si dai, li dai, vien dai

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 (luc van)) anh ((vi dat) OR (vi dai)) 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 (luc van)) anh ((vi dat) OR (vi dai)) 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 (luc van)) anh ((vi dat) OR (vi dai)) tren".
• Adding a wildcard symbol may retrieve word variants: thu sach y mang xa hoi. hieu va cau ((xuc van) or (luc van)) anh ((vi dat) OR (vi dai)) tren*.