Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
dinh hai » dinh thai, tinh hai, dinh ha
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hai cua » thai cua, dai cua, hoi cua
y nang » ky nang, ly nang, v nang
lao va » tao va, cao va, dao va
bao va » bao ve, tao va, ban va
cua tu » cua tuc, cua su, cua cu

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 y nang xa hoi. hieu vien dai ((lao va) OR (bao va)) dinh hai cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang xa hoi. hieu vien dai ((lao va) OR (bao va)) dinh hai cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. hieu vien dai ((lao va) OR (bao va)) dinh hai cua tu*.