Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
cua triet » cua viet, su triet, va triet
hinh hoc » sinh hoc, tin hoc, benh hoc
viec cam » viec lam, viec cua, viec va
lang xa » dang xay, lang van
lang ha » long ha
sach ky » sac ky, sach y, sach ty
va hinh » va chinh, va kinh, va tinh
cua tre » cua te, cuu tre, dua tren
tu sach » thu sach, su sach, te sach
xuc va » duc va, tuc va, luc va

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