Perhaps you should try some spelling variations:
hieu cac » hieu luc, hieu va, vien cac
hieu van » hieu va, thien van, lieu va
danh lai » danh sai, gianh lai, dinh lam
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang xa hoi. hien ((hieu cac) or (hieu van)) nuoc va danh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hien ((hieu cac) OR (hieu van)) nuoc va danh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hien ((hieu cac) or (hieu van)) nuoc va danh lai cua tre*.