Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
hac thuc » hoc thuc, ha thuc, thach thuc
va thanh » gia thanh, va tinh, le thanh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van hac » van hoc, van ha, van hai
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang xa hoi. hieu van hac thuc ((va thanh) or (ban thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. hieu van hac thuc ((va thanh) OR (ban thanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. hieu van hac thuc ((va thanh) or (ban thanh)) vi cua tre*.