Perhaps you should try some spelling variations:
nang giao » nang cao
van giao » toan giao, dan gian, dan giai
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
va cua » va chua, via cua, ca cua
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu ((van giao) or (nang giao)) duc van hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang x hoi. hieu ((van giao) OR (nang giao)) duc van hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky nang x hoi. hieu ((van giao) or (nang giao)) duc van hanh va cua tre*.