Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va trien » va truyen, va thiet, va tuyen
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
va nhan » van nhan, ca nhan, va phan
sach ty » sach y, sach tu, sach thu
duc ban » duc tan, duc van, dua ban
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
luc ban » cuc ban, luc bat, luc van

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 ((luc ban) or (duc ban)) hanh 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 ((luc ban) OR (duc ban)) hanh vi ((va trien) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. hieu va nhan ((luc ban) or (duc ban)) hanh vi ((va trien) or (su triet))*.