Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thuc dan » thuc hanh, hoc dan, thuc vat
hang hai » hoang hai, hang tai, thanh hai
nang hai » nang tai, dang hai, bang hai
nam thuc » nam thuoc, am thuc, nam thu
lang hoa » hang hoa, lang ha, nang hoa
hieu he » hieu ve, hiem he, hieu le
sach ky » sac ky, sach y, sach ty
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
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 sach ky lang hoa hoi. hieu he nam thuc dan ((nang hai) OR (hang hai)) cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang hoa hoi. hieu he nam thuc dan ((nang hai) OR (hang hai)) cua viet".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang hoa hoi. hieu he nam thuc dan ((nang hai) OR (hang hai)) cua viet*.