Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham tuc » nham thuc, pham thuc, tham thuc
dua tren » dung tren
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
tuc va » thuc va, truc va, tuc xa
vi dua » vi du, vi dum, vi lua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang xa hoi. hieu va cham tuc va danh vi dua tren~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky nang xa hoi. hieu va cham tuc va danh vi dua tren*.