Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
tang thanh » dang thanh, trung thanh, hoang thanh
thai cua » than cua, tai cuc, tri cua
duc tang » duc thang, duc tan, tuc tang
cua tre » cua te, cuu tre, cua triet
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
me hoi » le hoi
ve cac » va cac, vien cac
su xac » pu xac
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) or (su xac)) ky tang ((me hoi) or (mai hoi)). hieu ve cac duc tang thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su cac) OR (su xac)) ky tang ((me hoi) OR (mai hoi)). hieu ve cac duc tang thanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su cac) or (su xac)) ky tang ((me hoi) or (mai hoi)). hieu ve cac duc tang thanh thai cua tre*.