Perhaps you should try some spelling variations:
hang khoa » dung khoa
khoa doi » hoa doi, khoa hoi, khoa noi
nam thuc » nam thuoc, am thuc, nam thu
hang hai » hoang hai, hang tai, thanh hai
cua viet » ca viet, hoa viet, cua dieu
ky hang » ky nang, ly hang, ky dang
hieu he » hieu ve, hiem he, hieu le
thuc va » thuc vat, thuc dan, thuc day
va hang » van hang, va nang, va lang
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 hang khoa doi. hieu he nam thuc va hang hai ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky hang khoa doi. hieu he nam thuc va hang hai ((cua viet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: te sac ky hang khoa doi. hieu he nam thuc va hang hai ((cua viet) or (cua vat))*.