Perhaps you should try some spelling variations:
vien dai » hien dai
van hanh » van thanh, ban hanh, van anh
ve triet » va trien, su triet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
vien da » hien dai
toc van » hoc van, toc san, tac van
ma hoi » mai hoi, xa hoi, ma hoa
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: vu sach ky nang ma hoi. hieu ((vien dai) or (vien da)) toc van hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ma hoi. hieu ((vien dai) OR (vien da)) toc van hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ma hoi. hieu ((vien dai) or (vien da)) toc van hanh vi ve triet*.