Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
cua triet » cua viet, su triet, va triet
viec lam » viec va
tinh hoc » sinh hoc, tin hoc, hinh hoc
tu sach » thu sach, su sach, te sach
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
lam tuc » lam thuoc, lam truoc, luat tuc
va tinh » may tinh
cua tre » cua te, cuu tre, dua tren
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky lang) OR (ky dang)) xa hoi. nhieu viec lam tuc va tinh hoc ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky dang)) xa hoi. nhieu viec lam tuc va tinh hoc ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) OR (ky dang)) xa hoi. nhieu viec lam tuc va tinh hoc ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) OR (ky dang)) xa hoi. nhieu viec lam tuc va tinh hoc ((cua tre) or (cua triet))*.