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
va nhan » van nhan, ca nhan, va phan
hieu va » lieu va, hieu qua
cac ban » cac dan, cac van, cac bai
sach ky » sac ky, sach y, sach ty
can ban » van ban, toan ban
nang xa » nang x, lang xa, nang ma

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 ky nang xa hoi. hieu va nhan ((cac ban) OR (can ban)) hanh vi ((va trien) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu va nhan ((cac ban) OR (can ban)) hanh vi ((va trien) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu va nhan ((cac ban) OR (can ban)) hanh vi ((va trien) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu va nhan ((cac ban) OR (can ban)) hanh vi ((va trien) or (su triet))*.