Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh va » thanh van, hanh va, thanh ha
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
ky dang » ky danh
va chua » vua chua, ca chua, va chu
chua te » cua te, chua tu, chua xe
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ky dang) or (ky nang)) xay hoi. hieu ve cham ((xuc va) OR (luc va)) thanh va chua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky dang) OR (ky nang)) xay hoi. hieu ve cham ((xuc va) OR (luc va)) thanh va chua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky dang) or (ky nang)) xay hoi. hieu ve cham ((xuc va) OR (luc va)) thanh va chua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky dang) or (ky nang)) xay hoi. hieu ve cham ((xuc va) OR (luc va)) thanh va chua te*.