Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach cay » sach cap, sach hay, sach nay
dat tren » dat trong, dua tren
dang xay » dang van, van xay
cay dang » cao dang, cac dang, cay dan
xay hoi » xa hoi, tay hoi, cay phoi
xuc van » duc van, luc van, vuc van
hanh ve » hanh vi, hanh va, hanh kem
va cau » van cau, va dau, va cao
anh ve » anh va, anh viet, thanh ve

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 cay dang xay hoi. hieu ((va cau) or (va cac)) xuc van ((anh ve) OR (hanh ve)) dat tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach cay dang xay hoi. hieu ((va cau) OR (va cac)) xuc van ((anh ve) OR (hanh ve)) dat tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach cay dang xay hoi. hieu ((va cau) or (va cac)) xuc van ((anh ve) OR (hanh ve)) dat tren".
• Adding a wildcard symbol may retrieve word variants: thu sach cay dang xay hoi. hieu ((va cau) or (va cac)) xuc van ((anh ve) OR (hanh ve)) dat tren*.