Perhaps you should try some spelling variations:
dao phoi » dao thoi, dao phat, dao thi
cua tre » cua te, cuu tre, cua triet
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
lang ky » dang ky, bang ky, lang ke
hieu ve » hieu va, hieu van
tang ky » dang ky, trong ky, tang khu
va dao » ca dao
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((lang ky) or (tang ky)) va dao phoi. hieu ve cac tu va danh vi ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((lang ky) OR (tang ky)) va dao phoi. hieu ve cac tu va danh vi ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: tu ((lang ky) or (tang ky)) va dao phoi. hieu ve cac tu va danh vi ((cua tre) or (cua tu))*.