Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van nhan » van phan, van thanh, danh nhan
va trien » va truyen, va thiet, va tuyen
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
sach ky » sac ky, sach y, sach ty
cuu ban » cuu van, cua ban, cuu san
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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 van nhan ((duc ban) or (cuu ban)) hanh vi ((va trien) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang xa hoi. hieu van nhan ((duc ban) OR (cuu ban)) hanh vi ((va trien) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang xa hoi. hieu van nhan ((duc ban) or (cuu ban)) hanh vi ((va trien) or (su triet))*.