Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
trinh di » trinh do, trinh dien, trinh dinh
va trinh » van trinh, va tinh, lap trinh
viec cam » viec lam, viec cua, viec va
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
lang ha » long ha
lang xa » lang van
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
di cua » dai cua, doi cua, de cua

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