Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
xuc ban » duc ban, cuc ban, quoc ban
van cam » van nam, van lam, van cau
ky tang » ky nang, ky dang, ky trong
su xac » pu xac, su cac

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

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