Perhaps you should try some spelling variations:
vu sach » vu bach, vu khach
va hanh » van hanh, va thanh, va danh
cac bac » cac bai, cac ban, cac cach
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
su sach » so sach
cac tu » cac thu, cach tu, cac du
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) or (su sach)) ky nang xa hoi. hieu ve ((cac tu) or (cac bac)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky nang xa hoi. hieu ve ((cac tu) OR (cac bac)) va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky nang xa hoi. hieu ve ((cac tu) or (cac bac)) va hanh vi cua tre*.