Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach vu » sach va, sach tu, sach uu
sach xa » sach dao, sach nha, sach bai
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
soc van » hoc van, oc van, sac van
su tien » su kien, su hien, tu tieng
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: tu ((sach vu) or (sach xa)) nang xa hoi. hieu va cham soc van hanh vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach vu) OR (sach xa)) nang xa hoi. hieu va cham soc van hanh vi su tien.
• Adding a wildcard symbol may retrieve word variants: tu ((sach vu) or (sach xa)) nang xa hoi. hieu va cham soc van hanh vi su tien*.