Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
dan thuc » dan toc, am thuc
thuc cao » thuoc cao, thuc co, thuc can
viec dan » viec dang, viec ban, viec dat
sach ty » sach y, sach tu, sach thu
cao dan » cao dang, cao danh, cac dan
cua tre » cua te, cuu tre, dua tren
ty nang » ky nang, ty xang, ty hang
te sach » toc sach
dan va » doan va, dan ca, ban va
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. nhieu viec dan thuc cao dan va ((cua tre) or (((cua triet) OR (cua viet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. nhieu viec dan thuc cao dan va ((cua tre) OR (((cua triet) OR (cua viet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang x hoi. nhieu viec dan thuc cao dan va ((cua tre) or (((cua triet) OR (cua viet))))".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. nhieu viec dan thuc cao dan va ((cua tre) or (((cua triet) OR (cua viet))))*.