Perhaps you should try some spelling variations:
nang hai » hang hai, nang tai, dang hai
hang hoa » hang khoa, thanh hoa, hang va
cua viet » hoa viet, cua vat, cua dieu
thuc dan » thuc hanh, hoc dan, thuc vat
ca viet » va viet, co viet, hoa viet
ky hang » ky nang, ly hang, ky dang
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu he » hieu ve, hiem he, hieu le
thuc va » thuc vat, thuc day
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 hoa hoi. hieu he nam ((thuc va) OR (thuc dan)) nang hai ((cua viet) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky hang hoa hoi. hieu he nam ((thuc va) OR (thuc dan)) nang hai ((cua viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky hang hoa hoi. hieu he nam ((thuc va) OR (thuc dan)) nang hai ((cua viet) or (ca viet))".
• Adding a wildcard symbol may retrieve word variants: te sac ky hang hoa hoi. hieu he nam ((thuc va) OR (thuc dan)) nang hai ((cua viet) or (ca viet))*.