Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
vien dai » hien dai
su triet » su viet, su tien, ve triet
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
dai bao » dam bao, da bao, tai bao
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
bao va » bao ve, tao va, ban va

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

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