Perhaps you should try some spelling variations:
minh thanh » dinh thanh, tinh thanh, hinh thanh
thanh thai » thanh hai, thanh tai, nhanh thai
cao tang » cao dang
hieu van » hieu va, thien van, lieu va
xuc minh » duc minh, xuan minh, suc manh
thai cua » than cua, tai cuc, tri cua
ky tang » ky nang, ky dang, ky trong
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
su cac » tu cac, su cao, su can

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac ((ky tang) or (((kho tang) OR (cao tang)))) xa hoi. hieu van cam xuc minh thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ((ky tang) OR (((kho tang) OR (cao tang)))) xa hoi. hieu van cam xuc minh thanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac ((ky tang) or (((kho tang) OR (cao tang)))) xa hoi. hieu van cam xuc minh thanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su cac ((ky tang) or (((kho tang) OR (cao tang)))) xa hoi. hieu van cam xuc minh thanh thai cua tre*.