Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
viec cac » vien cac, viec cua, viec lam
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va tinh » may tinh
hoi cua » hoi chuc
nang o » nang co, nang ho, nang ro
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hai

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 ty nang o hoi. nhieu viec cac nuoc va tinh ((vi cua) or (hoi cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang o hoi. nhieu viec cac nuoc va tinh ((vi cua) OR (hoi cua)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hoi. nhieu viec cac nuoc va tinh ((vi cua) or (hoi cua)) triet*.