Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van thanh » ban thanh
vien day » vien dai, vien da, vien xay
van tuan » van quan, van ban, anh tuan
day thuc » dan thuc, cay thuc, dai thuc
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
su sach » so sach
cua tre » cua te, cuu tre, cua triet
le cua » ly cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (su sach)) tu nang xa hoi. hieu vien day thuc ((van thanh) or (van tuan)) le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) tu nang xa hoi. hieu vien day thuc ((van thanh) OR (van tuan)) le cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (su sach)) tu nang xa hoi. hieu vien day thuc ((van thanh) or (van tuan)) le cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (su sach)) tu nang xa hoi. hieu vien day thuc ((van thanh) or (van tuan)) le cua tre*.