Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
duc toan » duc tan, duc hoan, duc thang
va trien » va truyen, va thiet, va tuyen
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
duc ton » duc tan
anh vi » hanh vi, anh va, anh ve
vi va » vi van, vai va, vu va

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. hieu va phat ((duc toan) OR (duc ton)) anh vi va trien~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu va phat ((duc toan) OR (duc ton)) anh vi va trien*.