Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van thanh » ban thanh, van tuan
cay thuc » cay thuoc, day thuc, cach thuc
can thuc » dan thuc, van thuc, san thuc
thanh vi » hanh vi, thanh va, thanh ve
vu sach » vu bach, su sach, vu khach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di 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 tu nang xa hoi. hieu vien ((cay thuc) OR (can thuc)) van thanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach tu nang xa hoi. hieu vien ((cay thuc) OR (can thuc)) van thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach tu nang xa hoi. hieu vien ((cay thuc) OR (can thuc)) van thanh vi cua tre*.