Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
va tham » van tham, va cham, va thanh
lang xa » lang ha, dang xay, lang van
cuc ban » cua ban, cac ban, cuu ban
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, dua tren
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky lang xa hoi. hieu ((ve cam) or (va tham)) cuc ban hanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang xa hoi. hieu ((ve cam) OR (va tham)) cuc ban hanh vi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang xa hoi. hieu ((ve cam) or (va tham)) cuc ban hanh vi ((cua tre) or (cua triet))*.