Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
bo sach » co sach, hoc sach
ma hoi » mai hoi, xa hoi, me hoi
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
va cua » va chua, via cua, ca cua

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) or (bo sach)) ky nang ((ma hoi) OR (ma hoa)). hieu ve cam xuc va thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (bo sach)) ky nang ((ma hoi) OR (ma hoa)). hieu ve cam xuc va thanh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (bo sach)) ky nang ((ma hoi) OR (ma hoa)). hieu ve cam xuc va thanh va cua tre*".