Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
danh sai » dung sai, danh bat, danh dau
danh vai » danh va, doanh van, dang van
van cam » van nam, van lam, van cau
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
ma hoi » mai hoi, xa hoi, me hoi

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