Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van ban
tu sach » thu sach, te sach, tu cach
van anh » van thanh, tuan anh, van minh
dao xac » dan xac, dao cac, dau xac
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
v nang » va nang, vu nang, van nang
vi cua » vai cua, di cua
va dao » ca dao

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) or (su sach)) v nang xa hoi. hieu va dao xac ((van hanh) or (van anh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) v nang xa hoi. hieu va dao xac ((van hanh) OR (van anh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) v nang xa hoi. hieu va dao xac ((van hanh) or (van anh)) vi cua tre*.