Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
viec dan » viec dang, viec ban, viec dat
dan thuc » dan toc, am thuc
thuc cao » thuoc cao, thuc co, thuc can
te sach » toc sach
sach ty » sach y, sach tu, sach thu
dang vi » dung vi, dang va, hang vi
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, 5 hoi

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 ty xang ((x hoi) OR (x ho)). nhieu viec dan thuc cao dang vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty xang ((x hoi) OR (x ho)). nhieu viec dan thuc cao dang vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty xang ((x hoi) OR (x ho)). nhieu viec dan thuc cao dang vi cua tre*.