Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van chat » cao chat
hieu van » hieu va, thien van, lieu va
lang van » dang van, tang van, hoang van
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay
duc ban » duc tan, duc van, dua ban
cuu ban » cuu van, cua ban, cuu san
cua tre » cua te, cuu tre, cua triet
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) or (lang van)) hoi. hieu van chat ((duc ban) or (cuu ban)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((lang xa) OR (lang van)) hoi. hieu van chat ((duc ban) OR (cuu ban)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang xa) or (lang van)) hoi. hieu van chat ((duc ban) or (cuu ban)) hanh vi cua tre*.