Perhaps you should try some spelling variations:
nhieu viec » nhien viet
hieu viec » hieu ve, sieu viet, hieu hien
cua triet » cua viet, su triet, va triet
tai nuoc » tai quoc, thi nuoc, tham nuoc
dinh doi » dinh moi, tinh doi, dinh toi
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va dinh » van dinh, va kinh, va tinh
doi cua » dai cua, hoi cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang xa hoi. ((hieu viec) OR (nhieu viec)) tai nuoc va dinh doi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. ((hieu viec) OR (nhieu viec)) tai nuoc va dinh doi cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang xa hoi. ((hieu viec) OR (nhieu viec)) tai nuoc va dinh doi cua triet*.