Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cam thu » nam thu, cac thu, ca thu
su viet » so viet
cam tu » nam tu, dam tu, tam tu
x hoi » xa hoi, o hoi, x ho
ve su » va 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 hoi. hieu van ((cam tu) OR (cam thu)) ((va hanh) or (va danh)) ve su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu van ((cam tu) OR (cam thu)) ((va hanh) OR (va danh)) ve su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x hoi. hieu van ((cam tu) OR (cam thu)) ((va hanh) or (va danh)) ve su viet".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu van ((cam tu) OR (cam thu)) ((va hanh) or (va danh)) ve su viet*.