Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van ban
van nang » van quang, van ban, van dong
tu sach » thu sach, su sach, te sach
dau xac » dau xay, dan xac
van anh » van thanh, tuan anh, van minh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
v nang » va nang, vu nang, voi nang
vi cua » vai cua, di cua
va dau » va 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 ((v nang) or (van nang)) xa hoi. hieu va dau xac ((van hanh) or (van anh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((v nang) OR (van nang)) xa hoi. hieu va dau xac ((van hanh) OR (van anh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((v nang) or (van nang)) xa hoi. hieu va dau xac ((van hanh) or (van anh)) vi cua tre*.