Perhaps you should try some spelling variations:
nam truoc » nam thuoc, lam truoc, nam truc
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hanh doi » thanh doi, hanh noi, hang doi
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
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: tu sac ky nang x hoi. hieu van ((nam truoc) or (nam thu)) van hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. hieu van ((nam truoc) OR (nam thu)) van hanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. hieu van ((nam truoc) or (nam thu)) van hanh doi cua tre*.