Perhaps you should try some spelling variations:
nang hoa » nang hoat, hang hoa, nang hoc
thuc dan » thuc hanh, hoc dan, thuc vat
dung hai » dung tai, dung ha, dung sai
cua viet » ca viet, hoa viet, cua vat
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu he » hieu ve, hiem he, hieu le
thuc va » thuc vat, thuc day
hai cua » thai cua, dai cua, hoi cua
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
he nam » ha nam, nghe nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang hoa hoi. hieu he nam ((thuc va) or (thuc dan)) dung hai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang hoa hoi. hieu he nam ((thuc va) OR (thuc dan)) dung hai cua viet.
• Adding a wildcard symbol may retrieve word variants: te sac ky nang hoa hoi. hieu he nam ((thuc va) or (thuc dan)) dung hai cua viet*.