Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ban hang » ngan hang
va trien » va truyen, va thiet, va tuyen
su triet » su viet, su tien, ve triet
va nhan » van nhan, va phan, va nha
sach ty » sach y, sach tu, sach thu
luc ban » duc ban, cuc ban, luc bat
nang xa » nang x, lang xa, nang ma
hang vi » hang va, hanh vi, hang di
ty nang » ky nang, ty xang, ty hang

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