Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cac thu » cach thuc, cac thoi
nang ho » nang hoc, tang ho, nang cao
cua tre » cua te, cuu tre, dua tren
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
dao vi » dao voi, dao ve, dao va
va dao » ca dao
tu sac » tu sach, tu cac, tu san
thu va » thuc va, thue va, tu va
sac ky » cac ky, sai ky
ve cac » va cac, vien cac

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 ((nang ho) or (nang co)) hoi. hieu ve cac thu va dao vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang ho) OR (nang co)) hoi. hieu ve cac thu va dao vi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang ho) or (nang co)) hoi. hieu ve cac thu va dao vi ((cua tre) or (cua triet))*.