Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
phan luc » nhan luc, phan duc, phan suc
ban hanh » ban hang
va trien » va truyen, va thiet, va tuyen
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
va phan » van phan, va phat, va phap
luc ban » duc ban, cuc ban, luc bat

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