Perhaps you should try some spelling variations:
hieu nghe » lieu nghe, hiem ngheo, nhiem nghe
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
nang hoa » nang hoat, hang hoa, nang hoc
nghe nam » nghe lam, nghiep nam, nghe nano
nam thuc » nam thuoc, am thuc, nam thu
vat hang » van hang, dat hang, va hang
hang hai » hoang hai, hang tai, thanh hai
hoa hoi » khoa hoi, hoa hoc, hoa doi
su viet » so viet
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang hoa hoi. hieu nghe nam thuc vat hang hai ((cua triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang hoa hoi. hieu nghe nam thuc vat hang hai ((cua triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: toc sach y nang hoa hoi. hieu nghe nam thuc vat hang hai ((cua triet) or (su viet))*.