Perhaps you should try some spelling variations:
dua tren » dung tren
toc sach » hoc sach, doc sach, thuoc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
danh vi » hanh vi, dinh vi, danh di
xuc va » duc va, luc va, xac va
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 ((xuc va) OR (tuc va)) danh vi dua tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky nang xa hoi. hieu va cham ((xuc va) OR (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 ((xuc va) OR (tuc va)) danh vi dua tren*.