Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac co » cac cong
vi cua » vai cua, di cua
cac lo » cac lop, cac bo, cac ho
sac ky » cac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) or (sai ky)) nang xa hoi. hieu ve ((cac lo) OR (cac co)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sai ky)) nang xa hoi. hieu ve ((cac lo) OR (cac co)) van hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) or (sai ky)) nang xa hoi. hieu ve ((cac lo) OR (cac co)) van hanh vi cua tre*".