Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va
nang ma » tang ma, sang ma, nang cao
su hien » su kien, su tien, thu hien
vi su » va su, ve su, ki su

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 ky nang ma hoa. ((hieu ve) or (hieu van)) cam tuc ((van hanh) or (va danh)) vi su hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoa. ((hieu ve) OR (hieu van)) cam tuc ((van hanh) OR (va danh)) vi su hien.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoa. ((hieu ve) or (hieu van)) cam tuc ((van hanh) or (va danh)) vi su hien*.