Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh dao » lanh dao, thanh dat, thanh dam
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
dao cua » dai cua, day cua, dan cua
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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