Perhaps you should try some spelling variations:
thanh dam » thanh dat, thanh nam, thanh tam
hanh dai » hanh tai, hanh dao, vanh dai
cua tre » cua te, cuu tre, cua triet
cao duc » dao duc, cao suc, giao duc
qua cao » qua cac, qua ca, qua cai
sang xa » song xa, lang xa, sang ma
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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 ((sang xa) or (nang ma)) hoi. hieu qua cao duc va ((hanh dai) or (thanh dam)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((sang xa) OR (nang ma)) hoi. hieu qua cao duc va ((hanh dai) OR (thanh dam)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((sang xa) or (nang ma)) hoi. hieu qua cao duc va ((hanh dai) or (thanh dam)) cua tre*.