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