Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet

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 xa hoi. ((((hieu ve) or (hieu qua))) or (hieu quan)) cam xuc van hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((((hieu ve) OR (hieu qua))) OR (hieu quan)) cam xuc van hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((((hieu ve) or (hieu qua))) or (hieu quan)) cam xuc van hanh dai cua tre*.