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

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y 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: thuoc sach y 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: thuoc sach y nang xa hoi. hieu va nhan ((luc ban) or (duc ban)) hanh vi ((va trien) or (su triet))*.