Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
su triet » su viet, su tien, ve triet
te sach » toc sach
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
danh va » doanh va, hanh va, anh va
bao va » bao ve, tao va, cao va

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