Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
nang xay » dang xay, nganh xay, nang xuan
hieu van » hieu va, thien van, lieu va
duc manh » suc manh, duc anh, duc minh
thai cua » than cua, tai cuc, tri cua
xay hoi » xa hoi, tay hoi, cay phoi
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
su hai » su tai
hai ky » thai ky, hoi ky, hai ly

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

• Performing a fuzzy search may retrieve terms with similar spellings: su hai ky nang xay hoi. hieu van cam ((duc manh) or (duc va)) hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su hai ky nang xay hoi. hieu van cam ((duc manh) OR (duc va)) hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: su hai ky nang xay hoi. hieu van cam ((duc manh) or (duc va)) hanh thai cua tre*.