Perhaps you should try some spelling variations:
vuc nang » cuc nang, vu nang, chuc nang
te sach » toc sach
hanh di » hanh vi, hanh de, hang di
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
v nang » va nang, vu nang, van nang
di cua » dai cua, doi cua, de cua
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((v nang) or (vuc nang)) xa hoi. hieu va cam ((xuc va) OR (luc va)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((v nang) OR (vuc nang)) xa hoi. hieu va cam ((xuc va) OR (luc va)) hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((v nang) or (vuc nang)) xa hoi. hieu va cam ((xuc va) OR (luc va)) hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((v nang) or (vuc nang)) xa hoi. hieu va cam ((xuc va) OR (luc va)) hanh di cua tre*.