Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien cac » thien cac, vien cac, hieu cac
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, su sach, vu khach
cac bao » cach bao, cac bai, cac ban
va danh » va dinh, va dan, va hanh
te sach » toc sach
bao va » bao ve, tao va, ban va
va cua » va chua, via cua, ma cua
ca cua » co cua

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) or (vu sach)) ky nang xa hoi. hieu hien cac bao va danh ((va cua) OR (ca cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu sach)) ky nang xa hoi. hieu hien cac bao va danh ((va cua) OR (ca cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (vu sach)) ky nang xa hoi. hieu hien cac bao va danh ((va cua) OR (ca cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) ky nang xa hoi. hieu hien cac bao va danh ((va cua) OR (ca cua)) triet*.