Perhaps you should try some spelling variations:
ban hanh » ban hang
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
va tinh » may tinh
va danh » va dinh, va dan, va hanh
su viet » so viet
va cao » va cac, va co, va dao
cao tu » cao thu, co tu, cao su
ki su » ky su

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 x ho. lieu va cao tu ((va tinh) or (((va danh) or (ban hanh)))) ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x ho. lieu va cao tu ((va tinh) OR (((va danh) OR (ban hanh)))) ki su viet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. lieu va cao tu ((va tinh) or (((va danh) or (ban hanh)))) ki su viet*.