Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
tan hanh » tan thanh, tang hanh, toan hanh
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
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: su sach thieu ((nang xa) or (nang x)) hoi. hieu van pham duc tan hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thieu ((nang xa) OR (nang x)) hoi. hieu van pham duc tan hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach thieu ((nang xa) or (nang x)) hoi. hieu van pham duc tan hanh vi cua tre*.