Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
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: tu sac ky nang xa hoi. ((hieu van) or (thien van)) pham duc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. ((hieu van) OR (thien van)) pham duc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. ((hieu van) or (thien van)) pham duc van hanh vi cua tre*.