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

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 cam ((xuc va) OR (luc va)) thanh va cua 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 cam ((xuc va) OR (luc va)) thanh va cua 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 cam ((xuc va) OR (luc va)) thanh va cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky dang) or (ky nang)) xay hoi. hieu ve cam ((xuc va) OR (luc va)) thanh va cua te*.