Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
va triet » va thiet, va trien, ve triet
vien dai » hien dai
toc sach » hoc sach, doc sach, thuoc sach
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
dai bao » dam bao, da bao, tai bao
bao va » bao ve, tao va, ban va
va anh » van anh, va danh, va hanh
anh va » hanh va
va va » va van, va vua, va vai

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