Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
nang ho » nang hoc, nang co, tang ho
vai cua » dai cua, hai cua, lai cua
nang ro » nang co, nang ra, nang rong
hieu ve » hieu va, hieu van
cac tu » cac thu, cach tu, cac du
va con » va cong
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
va co » vo co

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