Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
dang xay » dang van, van xay
thuc dan » thuc hanh, hoc dan, thuc vat
thuc va » thuc vat, thuc day
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
ve nam » he nam, va nam, le nam
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 ((nang x) or (dang xay)) hoi. hieu ve nam ((thuc va) or (thuc dan)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang x) OR (dang xay)) hoi. hieu ve nam ((thuc va) OR (thuc dan)) hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang x) or (dang xay)) hoi. hieu ve nam ((thuc va) or (thuc dan)) hanh vai cua tre*.