Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, gian cac
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
vien da » vien dai, hien dai
toc van » hoc van, toc san, tac van
su sach » vu sach
vi ve » va ve, gi ve, ve ve

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

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