Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ve triet » va trien, su triet
ban hanh » ban hang
van nhan » van phan, van thanh, danh nhan
va nhan » ca nhan, va phan, va nha
sach ty » sach y, sach tu, sach thu
luc ban » duc ban, cuc ban, luc bat
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
su tien » su kien, su hien, tu tieng

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