Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
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
tu sach » thu sach, su sach, te 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: ((tu sach) or (vu sach)) ky nang xa hoi. hieu vien cac bao va danh ((va cua) OR (ca cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang xa hoi. hieu vien cac bao va danh ((va cua) OR (ca cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu sach)) ky nang xa hoi. hieu vien cac bao va danh ((va cua) OR (ca cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang xa hoi. hieu vien cac bao va danh ((va cua) OR (ca cua)) triet*.