Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van tuan » van quan, van ban, anh tuan
sach ky » sac ky, sach y, sach ty
tuan vi » quan vi, luan vi, quans vi
duc van » duc va, duc tan, duc manh
va cham » va chat, va tham
vu cham » vu kham, tu cham, qua cham
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di 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 ky lang xa hoi. hieu ((ve cam) or (((vu cham) or (va cham)))) duc van tuan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. hieu ((ve cam) OR (((vu cham) OR (va cham)))) duc van tuan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu ((ve cam) or (((vu cham) or (va cham)))) duc van tuan vi cua tre*.