Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
ban hang » ngan hang
sach ky » sac ky, sach y, sach ty
hang vi » hang va, hanh vi, hang di
xuc ban » duc ban, cuc ban, quoc ban
va chat » van chat, va phat, cao chat
va cham » va tham
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cuu tre » cua tre, cau tren, cau treo
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: hoc sach ky dang xa hoi. hieu ((va cham) OR (va chat)) xuc ban hang vi ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky dang xa hoi. hieu ((va cham) OR (va chat)) xuc ban hang vi ((cua te) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky dang xa hoi. hieu ((va cham) OR (va chat)) xuc ban hang vi ((cua te) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky dang xa hoi. hieu ((va cham) OR (va chat)) xuc ban hang vi ((cua te) or (cuu tre))*.