Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vien cac » vien bach, vien dai, gian cac
toc ban » toc san, toc ba, hoc ban
hanh de » hanh ve, hanh kem
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
vien da » vien dai, hien dai

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 ((vien cac) OR (vien da)) toc ban ((hanh de) or (hanh vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang xa hoi. hieu ((vien cac) OR (vien da)) toc ban ((hanh de) OR (hanh vi)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. hieu ((vien cac) OR (vien da)) toc ban ((hanh de) or (hanh vi)) cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang xa hoi. hieu ((vien cac) OR (vien da)) toc ban ((hanh de) or (hanh vi)) cua triet*.